Antonyms of adj beautiful

2 senses of beautiful

Sense 1
beautiful (vs. ugly) -- (delighting the senses or exciting intellectual or emotional admiration; "a beautiful child"; "beautiful country"; "a beautiful painting"; "a beautiful theory"; "a beautiful party")

ugly (vs. beautiful) -- (displeasing to the senses; "an ugly face"; "ugly furniture")
        => disfigured -- (having the appearance spoiled; "a disfigured face"; "strip mining left a disfigured landscape")
        => evil-looking -- (having an evil appearance)
        => fugly -- ((slang) extremely ugly)
        => grotesque, monstrous -- (distorted and unnatural in shape or size; abnormal and hideous; "tales of grotesque serpents eight fathoms long that churned the seas"; "twisted into monstrous shapes")
        => hideous, repulsive -- (so extremely ugly as to be terrifying; "a hideous scar"; "a repulsive mask")
        => ill-favored, ill-favoured -- (usually used of a face; "an ill-favored countenance")
        => scrofulous -- (having a diseased appearance resembling scrofula; "our canoe...lay with her scrofulous sides on the shore"- Farley Mowat)
        => unlovely, unpicturesque -- (without beauty or charm)
        => unsightly -- (unpleasant to look at; "unsightly billboards")

Sense 2
beautiful -- ((of weather) highly enjoyable; "what a beautiful day")

INDIRECT (VIA pleasant) -> unpleasant -- (disagreeable to the senses, to the mind, or feelings ; "an unpleasant personality"; "unpleasant repercussions"; "unpleasant odors")

Similarity of adj beautiful

2 senses of beautiful

Sense 1
beautiful (vs. ugly) -- (delighting the senses or exciting intellectual or emotional admiration; "a beautiful child"; "beautiful country"; "a beautiful painting"; "a beautiful theory"; "a beautiful party")
       => beauteous -- ((poetic )beautiful, especially to the sight)
       => bonny, bonnie, comely, fair, sightly -- (very pleasing to the eye; "my bonny lass"; "there's a bonny bay beyond"; "a comely face"; "young fair maidens")
       => dishy -- ((informal British) sexually attractive; "a dishy blonde")
       => exquisite -- (of extreme beauty; "her exquisite face")
       => fine-looking, good-looking, better-looking, handsome, well-favored, well-favoured -- (pleasing in appearance especially by reason of conformity to ideals of form and proportion; "a fine-looking woman"; "a good-looking man"; "better-looking than her sister"; "very pretty but not so extraordinarily handsome"- Thackeray; "our southern women are well-favored"- Lillian Hellman)
       => glorious, resplendent, splendid, splendiferous -- (having great beauty and splendor; "a glorious spring morning"; "a glorious sunset"; "splendid costumes"; "a kind of splendiferous native simplicity")
       => gorgeous -- (dazzlingly beautiful; "a gorgeous Victorian gown")
       => lovely -- (appealing to the emotions as well as the eye)
       => picturesque -- (suggesting or suitable for a picture; pretty as a picture; "a picturesque village")
       => pretty -- (pleasing by delicacy or grace; not imposing; "pretty girl"; "pretty song"; "pretty room")
       => pretty-pretty -- (ostentatiously or inappropriately pretty)
       => pulchritudinous -- (used of persons only; having great physical beauty; "pulchritudinous movie stars")
       => ravishing -- (stunningly beautiful; "a ravishing blonde")
       => scenic -- (used of locations; having beautiful natural scenery; "scenic drives")
       => stunning -- (strikingly beautiful or attractive; "quite stunning with large dark eyes and a beautiful high-bosomed figure"; "stunning photographs of Canada's wilderness areas")
          Also See-> attractive#1; graceful#1; pleasing#1

Sense 2
beautiful -- ((of weather) highly enjoyable; "what a beautiful day")
       => pleasant (vs. unpleasant) -- (affording pleasure; being in harmony with your taste or likings; "we had a pleasant evening together"; "a pleasant scene"; "pleasant sensations")