Antonyms of adj passionless

2 senses of passionless

Sense 1
passionless (vs. passionate) -- (not passionate; "passionless observation of human nature")

passionate (vs. passionless) -- (having or expressing strong emotions)
        => ablaze, aflame, aroused -- (keenly excited (especially sexually) or indicating excitement; "his face all ablaze with excitement"- Bram Stoker; "he was aflame with desire")
        => ardent, fervent, fervid, fiery, impassioned, perfervid, torrid -- (characterized by intense emotion; "ardent love"; "an ardent lover"; "a fervent desire to change society"; "a fervent admirer"; "fiery oratory"; "an impassioned appeal"; "a torrid love affair")
        => choleric -- (easily moved to anger; "men of the choleric type take to kicking and smashing"- H.G.Wells)
        => demon-ridden -- (as if possessed by demons)
        => fanatic, fanatical, overzealous, rabid -- (marked by excessive enthusiasm for and intense devotion to a cause or idea; "rabid isolationist")
        => lustful, lusty, concupiscent -- (vigorously passionate)
        => wild -- (in a state of extreme emotion; "wild with anger"; "wild with grief")

Sense 2
emotionless, passionless -- (unmoved by feeling; "he kept his emotionless objectivity and faith in the cause he served"; "this passionless girl was like an icicle in the sunshine"-Margaret Deland)

INDIRECT (VIA cold) -> hot -- (extended meanings; especially of psychological heat; marked by intensity or vehemence especially of passion or enthusiasm; "a hot temper"; "a hot topic"; "a hot new book"; "a hot love affair"; "a hot argument")

Similarity of adj passionless

2 senses of passionless

Sense 1
passionless (vs. passionate) -- (not passionate; "passionless observation of human nature")
       => platonic -- (free from physical desire; "platonic love")
       => unimpassioned -- (free from emotional appeal; marked by reasonableness; "answered with an unimpassioned defense"; "the unimpassioned intellect")
          Also See-> cold#2; unemotional#1; unenthusiastic#1

Sense 2
emotionless, passionless -- (unmoved by feeling; "he kept his emotionless objectivity and faith in the cause he served"; "this passionless girl was like an icicle in the sunshine"-Margaret Deland)
       => cold (vs. hot) -- (extended meanings; especially of psychological coldness; without human warmth or emotion; "a cold unfriendly nod"; "a cold and unaffectionate person"; "a cold impersonal manner"; "cold logic"; "the concert left me cold")