Synonyms for Unattractive:

adj.

bad (adjective)
unpleasant.
ugly (adjective)
shapeless, repellent, plain, unappealing, repugnant, unsightly, unaesthetic, ugly, odious, inelegant, abhorrent, repulsive, displeasing, disagreeable, unlovely, disfigured, undesirable, homely, unpleasing, not much to look at, Ill-looking, grotesque, hideous, unpleasant.
uncomely (adjective)
not much to look at, short on looks, not much for looks.

n.

beautiful, bad, not much for looks, short on looks, awful, uncomely, hard, bleak, objectionable, not much to look at, harsh. grim. unattractive (noun)
plain, unprepossessing, unpresentable, untempting, unappealing, subfusc, homely.

Other synonyms:

objectionable, uncomely. bleak. harsh. awful, grim. hard. bad. Other relevant words:
bleak, objectionable, unprepossessing, grim, uncomely, awful, unpresentable, beautiful, not much to look at, not much for looks, short on looks, harsh, bad, untempting, hard, subfusc.

Usage examples for unattractive

  1. The daughter of the Back Bay millionaire was not unattractive herself. – The Corner House Girls on Palm Island by Grace Brooks Hill Thelma Gooch
  2. But, unattractive as this was for a mortal dwelling- place, its partial shelter was already pre- empted, and, like hundreds of others, I made an open night of it. – Campaigning with Crook and Stories of Army Life by Charles King
  3. It was an odd room, a curious mixture of German and American taste and yet not unattractive – The Camp Fire Girls Across the Seas by Margaret Vandercook