Antonyms of adj playful

1 sense of playful

Sense 1
playful (vs. unplayful) -- (full of fun and high spirits; "playful children just let loose from school")

unplayful (vs. playful), serious, sober -- (completely lacking in playfulness)

Similarity of adj playful

1 sense of playful

Sense 1
playful (vs. unplayful) -- (full of fun and high spirits; "playful children just let loose from school")
       => coltish, frolicsome, frolicky, rollicking, sportive -- (given to merry frolicking; "frolicsome students celebrated their graduation with parties and practical jokes")
       => devilish, rascally, roguish -- (playful in an appealingly bold way; "a roguish grin")
       => elfin, elfish, elvish -- (usually good-naturedly mischievous; "perpetrated a practical joke with elfin delight"; "elvish tricks")
       => arch, impish, implike, mischievous, pixilated, prankish, puckish, wicked -- (naughtily or annoyingly playful; "teasing and worrying with impish laughter"; "a wicked prank")
       => kittenish, frisky -- (playful like a lively kitten)
       => mocking, teasing, quizzical -- (playfully vexing (especially by ridicule); "his face wore a somewhat quizzical almost impertinent air"- Lawrence Durrell)