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

adj not deliberate

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
without motivation
without apparent forethought or prompting or planning
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
provided with a motive or given incentive for action
designed or carried out according to a plan
characterized by deliberate purpose and some degree of planning
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