passionless

adjective

1 he was not as passionless as they made out:

unemotional, cold, cold-blooded, emotionless, frigid, cool, unfeeling, unloving, unresponsive, undemonstrative, impassive, withdrawn, unapproachable, aloof, detached, distant, dispassionate, remote.

▷antonyms passionate.

2 the whole movie seems oddly passionless:

dull, boring, lacking in vitality, spiritless, lifeless, soulless, wooden, dry, desiccated, flat, uninspired, unimpassioned, insipid, lacklustre, colourless, anaemic, bloodless, vapid.

▷antonyms exciting.

passionless Oxford Dictionary of English