UNDESIRABLE Meaning of UNDESIRABLE in English [un.de.sir.able] adj (1667): not desirable: unwanted -- un.de.sir.abil.i.ty n -- un.de.sir.able.ness n -- un.de.sir.ably adv [2]undesirable n (1883): one that is undesirable Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012