unresponsive (adj.)

• arctic
• autistic
• blunt
• callous
• calloused
• catatonic
• chilly
• cold
• cold-blooded
• coldhearted
• cool
• dispassionate
• drugged
• dull
• emotionless
• frigid
• frosted
• frosty
• frozen
• hard
• hardened
• hardhearted
• heartless
• icy
• immovable
• impassive
• impervious
• inflexible
• inhibited
• insensitive
• insentient
• insusceptible
• obdurate
• objective
• obstinate
• obtuse
• passionless
• self-absorbed
• soulless
• spiritless
• stonyhearted
• unaffectionate
• undersexed
• unemotional
• unfeeling
• unimpassioned
• unimpressionable
• unloving
• unmerciful
• unmovable
• unnatural
• unpersuadable
• unreceptive
• unsusceptible
• unsympathetic
• untouchable
• unyielding