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Definitions

ex

[eks] / ɛks /
ADJECTIVE
erstwhile
Synonyms
STRONG
once
WEAK
bygone late old one-time past preceding previous quondam sometime
ADJECTIVE
previous
Synonyms
STRONGEST
earlier past preceding
WEAK
antecedent anterior erstwhile foregoing one-time precedent quondam sometime
Antonyms
WEAK
current future later on time present timely well-timed
ex-
ADJECTIVE
no longer
Synonyms
STRONGEST
bygone erstwhile former past
STRONG
dead deceased defunct extinct obsolescent obsolete
WEAK
late quondam
ADJECTIVE
former
Synonyms
STRONGEST
departed erstwhile old
STRONG
above ancient antecedent anterior bygone first past prior
WEAK
aforementioned aforesaid earlier foregoing late long gone long-ago of yore once one-time preceding quondam sometime whilom
Antonyms
STRONG
after modern new
WEAK
current ensuing following future present prospective subsequent succeeding
ADJECTIVE
late
Synonyms
STRONGEST
old once past previous sometime
WEAK
asleep bygone cold deceased defunct departed erstwhile exanimate extinct former inanimate lifeless onetime preceding quondam
Antonyms
STRONGEST
current future present
WEAK
antique early live old-fashioned on time prompt punctual
ADJECTIVE
outgoing
Synonyms
STRONG
departing last retiring withdrawing
WEAK
former migratory outbound outward-bound past
Antonyms
STRONGEST
incoming
WEAK
arriving entering
ADJECTIVE
past
Synonyms
STRONGEST
earlier early late old preceding previous prior recent
STRONG
ancient bygone latter over
WEAK
ages ago ancient history back when behind one bypast down memory lane erstwhile foregoing gone-by good old days latter-day long-ago olden days once one-time quondam retired sometime time was way back way back when
Antonyms
STRONGEST
after current future later on time
STRONG
modern new
WEAK
present

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 the latest reality TV series caught in the relationship dust-up involving Mortensen and his ex, Taylor Frankie Paul.

From Los Angeles Times • Apr. 3, 2026

A future bandmate’s ex had one of her songs on a playlist, having no idea it was Small.

From Los Angeles Times • Apr. 3, 2026

She responded, again, that she could not talk with him ex parte.

From Slate • Mar. 11, 2026

As opposed to calling your ex, use written communication like email.

From MarketWatch • Mar. 9, 2026

My cheating ex, Rob, never met my father.

From "The Sun Is Also a Star" by Nicola Yoon

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.