| deaf to(expression, adjective, callous, unexcitable, hard-as-nails) |
| detached(adjective, calm, cool, relaxed, casual) |
| disinterested(adjective, calm, cool, relaxed, detached) |
| easy(adjective, calm, cool, relaxed, detached) |
| easygoing(adjective, calm, cool, relaxed, detached) |
| expressionless(adjective, blank, unemotional, emotionless, inexpressive) |
| feelingless(adjective, unfeeling, hard-hearted, nowhere, obdurate) |
| gradual(adjective, cold, indifferent, unresponsive, numb) |
| hard-as-nails(adjective, callous, unexcitable) |
| hard as nails(expression, adjective, idiom, stiff, unfeeling) |
| impassible |
| imperceivable(adjective, cold, indifferent, unresponsive, numb) |
| imperceptible(adjective, cold, indifferent, unresponsive, numb) |
| inanimate(adjective, cold, indifferent, unresponsive, numb) |
| inappreciable(adjective, cold, indifferent, unresponsive, numb) |
| insensate(adjective, cold, indifferent, unresponsive, numb) |
| iron-fisted(adjective, prearranged, dogged, ironfisted, unabated) |
| iron-hearted(adjective, unfeeling, hard-hearted, nowhere, obdurate) |
| ironfisted(adjective, prearranged, dogged, unabated) |
| lackadaisical(adjective, calm, cool, relaxed, detached) |