undesirable

Universal Words adjective, noun adjective not wanted or approved of; likely to cause trouble or problems: undesirable behaviour / consequences / effects * It would be highly undesirable to increase class sizes further. * prostitution and other undesirable practices * These alternatives are economically undesirable. OPPDESIRABLE undesirably adverb noun [usuallypl.] 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.