Synonyms of passive

1 Syllable
slow, meek, quiet, cool, flat, slack
2 Syllables
slowest, meekest, stagnant, moony, laid-back, inert, bearing, dormant, patient, latent, lazy, idle, torpid, laziest, sleepy, quiescent, static, lazier, meeker, asleep, draggier, stretchy, draggy, slothful, mopish, yielding, compliant, slower, listless, stolid
3 Syllables
half-hearted, enduring, nonviolent, servile, vestigial, forbearing, powerless, incurious, acquiescent, halfhearted, passionless, docile, unloving, resigned, phlegmatic, unready, mothballed, motionless, gridlocked, henpecked, slow-moving, giving-in, tractable, lethargic
4 Syllables
submissive, unreactive, apathetic, long-suffering, inactive, uninvolved, poker-faced, longanimous, energyless, comformable, unindustrious, unflappable, unresisting, indifferent, unrealized, receptive, nonresistant
5 Syllables
unassertive, unresponsive, unexcitable, lackadaisical, tortoiselike, unenergetic, disenfranchised