passionless

adjectives

not passionate
"passionless observation of human nature"
antonym
is similar to
free from physical desire
"platonic love"
is similar to
free from emotional appeal; marked by reasonableness
"answered with an unimpassioned defense"; "the unimpassioned intellect"
see also
unsusceptible to or destitute of or showing no emotion
see also
not enthusiastic; lacking excitement or ardor
"an unenthusiastic performance by the orchestra"; "unenthusiastic applause"
see also
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"
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