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in fallible
adjective as in infallible
Strongest matches
Weak matches
adjective as in absolute
adjective as in necessary
adjective as in right
Weak matches
adjective as in sure
adjective as in unerring
adjective as in unfailing
Strongest matches
Weak matches
- absolute
- assiduous
- ceaseless
- come-through
- consistent
- constant
- continual
- continuing
- continuous
- counted-on
- delivering
- dependable
- diligent
- dyed-in-the-wool
- endless
- faithful
- infallible
- invariable
- loyal
- never-failing
- persistent
- reliable
- rock solid
- same
- solid
- staunch
- straight
- sure
- surefire
- there
- tried-and-true
- true
- trustworthy
- unlimited
- unrelenting
adjective as in accurate
Strongest matches
adjective as in surefire
adjective as in certain
Weak matches
- ascertained
- authoritative
- conclusive
- confirmable
- demonstrable
- destined
- determined
- establishable
- evident
- firm
- fixed
- guaranteed
- having down pat
- in the bag
- incontrovertible
- indubitable
- infallible
- irrefutable
- known
- on ice
- plain
- predestined
- provable
- reliable
- salted away
- set
- sound
- supreme
- trustworthy
- unambiguous
- undoubted
- unequivocal
- unerring
- unmistakable
- verifiable
adjective as in inarguable
Weak matches
- absolute
- ascertained
- authoritative
- clear
- conclusive
- confirmable
- definite
- demonstrable
- destined
- determined
- establishable
- evident
- firm
- fixed
- genuine
- guaranteed
- hard
- having down pat
- in the bag
- incontestable
- incontrovertible
- indisputable
- indubitable
- infallible
- irrefutable
- known
- on ice
- plain
- positive
- predestined
- provable
- real
- reliable
- safe
- salted away
- set
- sound
- supreme
- sure
- sure thing
- true
- trustworthy
- unambiguous
- unassailable
- undeniable
- undisputable
- undoubted
- unequivocal
- unerring
- unmistakable
- unquestionable
- verifiable
adjective as in incontestable
Weak matches
- absolute
- ascertained
- authoritative
- clear
- conclusive
- confirmable
- definite
- demonstrable
- destined
- determined
- establishable
- evident
- firm
- fixed
- genuine
- guaranteed
- hard
- having down pat
- in the bag
- inarguable
- incontrovertible
- indisputable
- indubitable
- infallible
- irrefutable
- known
- on ice
- plain
- positive
- predestined
- provable
- real
- reliable
- safe
- salted away
- set
- sound
- supreme
- sure
- sure thing
- true
- trustworthy
- unambiguous
- unassailable
- undeniable
- undisputable
- undoubted
- unequivocal
- unerring
- unmistakable
- unquestionable
- verifiable
adjective as in unassailable
Weak matches
- ascertained
- authoritative
- clear
- confirmable
- definite
- demonstrable
- destined
- determined
- establishable
- evident
- firm
- fixed
- genuine
- guaranteed
- hard
- having down pat
- in the bag
- inarguable
- incontestable
- incontrovertible
- indubitable
- known
- on ice
- plain
- positive
- predestined
- provable
- real
- reliable
- safe
- salted away
- set
- sound
- supreme
- sure
- sure thing
- true
- trustworthy
- unambiguous
- undisputable
- undoubted
- unerring
- unmistakable
- unquestionable
- verifiable
adjective as in undisputable
Weak matches
- absolute
- ascertained
- authoritative
- clear
- conclusive
- confirmable
- definite
- demonstrable
- destined
- determined
- establishable
- evident
- firm
- fixed
- genuine
- guaranteed
- hard
- having down pat
- in the bag
- inarguable
- incontestable
- incontrovertible
- indisputable
- indubitable
- infallible
- irrefutable
- known
- on ice
- plain
- positive
- predestined
- provable
- real
- reliable
- safe
- salted away
- set
- sound
- supreme
- sure
- sure thing
- true
- trustworthy
- unambiguous
- unassailable
- undeniable
- undoubted
- unequivocal
- unerring
- unmistakable
- unquestionable
- verifiable
adjective as in impeccable
adjective as in infallible
Strongest matches
Weak matches
adjective as in absolute
adjective as in necessary
adjective as in right
Weak matches
adjective as in sure
adjective as in unerring
adjective as in unfailing
Strongest matches
Weak matches
- absolute
- assiduous
- ceaseless
- come-through
- consistent
- constant
- continual
- continuing
- continuous
- counted-on
- delivering
- dependable
- diligent
- dyed-in-the-wool
- endless
- faithful
- infallible
- invariable
- loyal
- never-failing
- persistent
- reliable
- rock solid
- same
- solid
- staunch
- straight
- sure
- surefire
- there
- tried-and-true
- true
- trustworthy
- unlimited
- unrelenting
adjective as in accurate
Strongest matches
adjective as in surefire
adjective as in certain
Weak matches
- ascertained
- authoritative
- conclusive
- confirmable
- demonstrable
- destined
- determined
- establishable
- evident
- firm
- fixed
- guaranteed
- having down pat
- in the bag
- incontrovertible
- indubitable
- infallible
- irrefutable
- known
- on ice
- plain
- predestined
- provable
- reliable
- salted away
- set
- sound
- supreme
- trustworthy
- unambiguous
- undoubted
- unequivocal
- unerring
- unmistakable
- verifiable
adjective as in inarguable
Weak matches
- absolute
- ascertained
- authoritative
- clear
- conclusive
- confirmable
- definite
- demonstrable
- destined
- determined
- establishable
- evident
- firm
- fixed
- genuine
- guaranteed
- hard
- having down pat
- in the bag
- incontestable
- incontrovertible
- indisputable
- indubitable
- infallible
- irrefutable
- known
- on ice
- plain
- positive
- predestined
- provable
- real
- reliable
- safe
- salted away
- set
- sound
- supreme
- sure
- sure thing
- true
- trustworthy
- unambiguous
- unassailable
- undeniable
- undisputable
- undoubted
- unequivocal
- unerring
- unmistakable
- unquestionable
- verifiable
adjective as in incontestable
Weak matches
- absolute
- ascertained
- authoritative
- clear
- conclusive
- confirmable
- definite
- demonstrable
- destined
- determined
- establishable
- evident
- firm
- fixed
- genuine
- guaranteed
- hard
- having down pat
- in the bag
- inarguable
- incontrovertible
- indisputable
- indubitable
- infallible
- irrefutable
- known
- on ice
- plain
- positive
- predestined
- provable
- real
- reliable
- safe
- salted away
- set
- sound
- supreme
- sure
- sure thing
- true
- trustworthy
- unambiguous
- unassailable
- undeniable
- undisputable
- undoubted
- unequivocal
- unerring
- unmistakable
- unquestionable
- verifiable
adjective as in unassailable
Weak matches
- ascertained
- authoritative
- clear
- confirmable
- definite
- demonstrable
- destined
- determined
- establishable
- evident
- firm
- fixed
- genuine
- guaranteed
- hard
- having down pat
- in the bag
- inarguable
- incontestable
- incontrovertible
- indubitable
- known
- on ice
- plain
- positive
- predestined
- provable
- real
- reliable
- safe
- salted away
- set
- sound
- supreme
- sure
- sure thing
- true
- trustworthy
- unambiguous
- undisputable
- undoubted
- unerring
- unmistakable
- unquestionable
- verifiable
adjective as in undisputable
Weak matches
- absolute
- ascertained
- authoritative
- clear
- conclusive
- confirmable
- definite
- demonstrable
- destined
- determined
- establishable
- evident
- firm
- fixed
- genuine
- guaranteed
- hard
- having down pat
- in the bag
- inarguable
- incontestable
- incontrovertible
- indisputable
- indubitable
- infallible
- irrefutable
- known
- on ice
- plain
- positive
- predestined
- provable
- real
- reliable
- safe
- salted away
- set
- sound
- supreme
- sure
- sure thing
- true
- trustworthy
- unambiguous
- unassailable
- undeniable
- undoubted
- unequivocal
- unerring
- unmistakable
- unquestionable
- verifiable
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Synonym of the day
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On this page you'll find 645 synonyms, antonyms, and words related to in-fallible, such as: authoritative, flawless, foolproof, unbeatable, acceptable, and accurate.
From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.
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