1. [adj]  not able to attract favorable attention; "they have made the place as unappealing as possible"; "was forced to talk to his singularly unappealing hostess"
2. [adj]  (of characters in literature or drama) tending to evoke antipathetic feelings; "all the characters were peculiarly unsympathetic"

UNAPPEALING is a 11 letter word that starts with U.