Antonyms of adj impassioned

1 sense of impassioned

Sense 1
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")

INDIRECT (VIA passionate) -> passionless -- (not passionate; "passionless observation of human nature")

Similarity of adj impassioned

1 sense of impassioned

Sense 1
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")
       => passionate (vs. passionless) -- (having or expressing strong emotions)