/ ˌʌndɪˈzaɪərəbl; NAmE / adjective , noun
■ adjective
not wanted or approved of; likely to cause trouble or problems :
undesirable consequences / effects
It would be highly undesirable to increase class sizes further.
prostitution and other undesirable practices
OPP desirable
► un·desir·ably / -əbli; NAmE / adverb
■ noun
[ usually pl. ] a person who is not wanted in a particular place, especially because they are considered dangerous or criminal :
He's been mixing with drug addicts and other undesirables.