| imperceptive(adjective, indifferent, unkind, unresponsive, heartless) |
| impercipient |
| imperturbable(adjective, calm, cool, cold, cruel) |
| implacable(adjective, mean, hard, severe, evil) |
| indurated(adjective, hard, cool, firm, cruel) |
| inure(verb, dull, develop, rough, adjust) |
| irresponsive(adjective, bad, cold, aloof, no feelings) |
| lackadaisical(adjective, indifferent, unsympathetic, inattentive, uninterested) |
| lukewarm(adjective, calm, mean, hard, cool) |
| marble-hearted(adjective, bad, cold, aloof, no feelings) |
| mouthy(adjective, insolent) |
| narcotic(adjective, senseless) |
| phlegmatic(adjective, cool, indifferent, detached, unfriendly) |
| presumptuous(adjective, insolent) |
| rocky(adjective, set, strong, hard, firm) |
| sacrilegious(adjective, insolent) |
| sadistic(adjective, mean, evil, nasty, harsh) |
| sarcastic(adjective, hard, unkind, insolent, cutting) |
| saucy(adjective, insolent) |
| set(verb, adjective, close, fix, hard) |