Unimpassioned is a related term of impassive.
As adjectives the difference between unimpassioned and impassive
is that unimpassioned is not impassioned; lacking passion; without emotion while impassive is having, or revealing, no emotion.
unimpassioned
English
Adjective
(
en adjective)
Not impassioned; lacking passion; without emotion.
Derived terms
* unimpassionedly
impassive
English
Adjective
(
en adjective)
Having, or revealing, no emotion.
Still or motionless.
Synonyms
* apathetic, phlegmatic