undesirable

adj

1. Not desirable, objectionable or not likely to please.

   “There would be no need for any of the animals to come in contact with human beings, which would clearly be most undesirable.”

   “Chronic venous disease includes cosmetically undesirable telangiectasias, varicose veins, venous ulceration, and claudication.”

   “[David] Brog spoke movingly of his immigrant grandfather as a triumph of the assimilationist model—a Romanian Jew who emigrated to America, learned English, and became a good patriotic American—but failed to mention that the 1924 Immigration Act was designed specifically to exclude Eastern European Jews (among other undesirable European ethnic groups) from entering the country.”

noun

1. (in-plural, often)An undesirable person.

   “The Matchmaking Festival provided social events for these lonely-hearted pilgrims, and allowed local personages to keep undesirables away from their daughters.”

   “The Camden Bench is not an anomaly: more and more, our cities are being designed to keep those deemed as ‘undesirables’ out. By its very nature this is ‘hostile architecture’—urban design with a focus on exclusion, design that inhibits community and tells us who is welcome and who is not.”