Antonyms of adj unstylish
2 senses of unstylish
Sense 1
styleless (vs. stylish), unstylish -- (lacking in style or elegance; "a styleless way of dressing"; "expensive but styleless country tweeds"; "wearing unstylish clothes")
Sense 2
unfashionable (vs. fashionable), unstylish -- (not in accord with or not following current fashion; "unfashionable clothes"; "melodrama of a now unfashionable kind")
Similarity of adj unstylish
2 senses of unstylish
Sense 1
styleless (vs. stylish), unstylish -- (lacking in style or elegance; "a styleless way of dressing"; "expensive but styleless country tweeds"; "wearing unstylish clothes")
=> dowdy -- (lacking in smartness or taste; "a dowdy grey outfit"; "a clean and sunny but completely dowdy room")
Sense 2
unfashionable (vs. fashionable), unstylish -- (not in accord with or not following current fashion; "unfashionable clothes"; "melodrama of a now unfashionable kind")
=> antique, demode, ex, old-fashioned, old-hat (predicate), outmoded, passe, passee -- (out of fashion; "a suit of rather antique appearance"; "demode (or outmoded) attire"; "outmoded ideas")
=> dated -- (marked by features of the immediate and usually discounted past)
=> dowdy, frumpy, frumpish -- (primly out of date; "nothing so frumpish as last year's gambling game")
=> fogyish, moss-grown, mossy, stick-in-the-mud (predicate), stodgy -- ((used pejoratively) out of fashion; old fashioned; "moss-grown ideas about family life")
=> out -- (no longer fashionable; "that style is out these days")
=> prehistoric -- (no longer fashionable; "my mother has these prehistoric ideas about proper clothes")
Also See-> old#2