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Definitions

unsure

[uhn-shoor, ‐shur] / ʌnˈʃʊər, ‐ʃɜr /
ADJECTIVE
doubtful, insecure
Synonyms
STRONGEST
distrustful dubious hesitant indecisive mistrustful shaky skeptical suspicious uncertain unclear unconvinced undecided
WEAK
betwixt and between borderline fluctuant fly-by-night iffy in a quandary indeterminate irresolute lacking open problematic rootless touch and go unassured unconfident undependable unreliable unstable untrustworthy untrusty up for grabs vacillating wavering weak wimpy wobbly
Antonyms
STRONGEST
believing certain clear definite determined indubious sure trustworthy trusty undoubted unwavering
WEAK
secure

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

"It's truly very sad to know people had to abandon homes built over a lifetime, unsure if they will ever return."

From Barron's • Apr. 5, 2026

However, it paid off and soon Clark was in the Vatican nervously waiting to meet Leo XIV, unsure whether to shake his hand or what questions to ask.

From BBC • Apr. 2, 2026

For years, scientists were unsure where TMEM175 was located in cells or what it actually did.

From Science Daily • Mar. 26, 2026

“You can be bold. You can be silly. You can be competent and unsure of all your acts at the same time,” Davis said during her opening remarks.

From Los Angeles Times • Mar. 24, 2026

Everyone looked dejected, as if unsure if they had a future.

From "Mountains Beyond Mountains" by Tracy Kidder and Michael French