Antonyms of adj unpopular

1 sense of unpopular

Sense 1
unpopular (vs. popular) -- (regarded with disfavor or lacking general approval; "unpopular ideas"; "an unpopular war")

popular (vs. unpopular) -- (regarded with great favor, approval, or affection especially by the general public; "a popular tourist attraction"; "a popular girl"; "cabbage patch dolls are no longer popular")
        => best-selling (predicate) -- (selling in great numbers; "a best-selling novel")
        => fashionable -- (patronized by)
        => favorite, favourite -- (appealing to the general public; "a favorite tourist attraction")
        => hot -- (very popular or successful; "one of the hot young talents"; "cabbage patch dolls were hot last season")
        => touristed, touristy -- (visited by throngs of tourists; "of the three American Virgin islands St. Thomas is the most touristed"; "tourists descend in busloads...so the whole place is rather touristy")

Similarity of adj unpopular

1 sense of unpopular

Sense 1
unpopular (vs. popular) -- (regarded with disfavor or lacking general approval; "unpopular ideas"; "an unpopular war")
       => less-traveled -- (not visited by many travelers; "the tourist's desire to visit less-traveled countries")