unintended

If you do something without planning or meaning to do it, it's unintended. An unintended consequence of your fun day at the beach is your painful, peeling sunburn.

To intend is to plan or aim to do something. When you don't intend to do something but it happens anyway, it's unintended. An unintended side effect of your winning the 50-yard dash might be the extreme envy of your sister, who's very athletic and loves to win. And if you let her trim your hair later, you may just end up with unintended bangs!

Definitions of unintended

adjective
not deliberate

Synonyms:
accidental, inadvertent
happening by chance or unexpectedly or unintentionally

causeless, fortuitous, uncaused
having no cause or apparent cause

unintentional, unplanned, unwitting
not done with purpose or intent

unmotivated
without motivation

unplanned
without apparent forethought or prompting or planning

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Antonyms:
intended
resulting from one's intentions

conscious, witting
intentionally conceived

calculated, deliberate, measured
carefully thought out in advance

intentional, knowing
characterized by conscious design or purpose

well-intentioned, well-meaning, well-meant
marked by good intentions though often producing unfortunate results

motivated
provided with a motive or given incentive for action

planned
designed or carried out according to a plan

premeditated
characterized by deliberate purpose and some degree of planning

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