insusceptible (adj.)
- arctic
- autistic
- blunt
- catatonic
- chilly
- cold
- cold-blooded
- coldhearted
- cool
- dispassionate
- drugged
- dull
- emotionless
- frigid
- frosted
- frosty
- frozen
- heartless
- icy
- immovable
- impassive
- insensitive
- insentient
- objective
- obtuse
- passionless
- self-absorbed
- soulless
- spiritless
- unaffectionate
- unemotional
- unfeeling
- unimpassioned
- unimpressionable
- unloving
- unresponsive
- unsusceptible
- unsympathetic
- untouchable
