I. -ˈzī-rə-bəl adjective
Date: 1667
: not desirable : unwanted
undesirable side effects
• un·de·sir·abil·i·ty -ˌzī-rə-ˈbi-lə-tē noun
• un·de·sir·able·ness -ˈzī-rə-bəl-nəs noun
• un·de·sir·ably -blē adverb
II. noun
Date: 1883
: one that is undesirable