Longman Dictionary of Contemporary English homepage

undesirable

1 adjective
     
un‧de‧sir‧a‧ble1 formal
something or someone that is undesirable is not welcome or wanted because they may affect a situation or person in a bad way
undesirable effects/consequences etc
The drug may have other undesirable effects.
punishment of undesirable behaviour
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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