| stupefied(adjective, dull, unintelligent, witless, insensibility) |
| tactless(adjective, hard, indifferent, vulgar, thoughtless) |
| torpid(adjective, dull, hard, slow, stupid) |
| unsusceptible(noun, adjective, hard, indifferent, unfeeling) |
| Boeotian |
| besotted(adjective, dull, simple, slow, stupid) |
| birdbrained(adjective, innocent, thick, unfamiliar, unconscious) |
| cold(adjective, hard, unfeeling, unsympathetic, hardened) |
| cold-blooded(adjective, hard, unfeeling, unsympathetic, hardened) |
| cold as charity(expression, idiom, insensibility) |
| cold blooded(expression, adjective, idiom, aloof, unfeeling) |
| cretinous(adjective, innocent, thick, unfamiliar, unconscious) |
| dimmed |
| feather-brained |
| half-witted(adjective, dull, simple, slow, silly) |
| halfwitted |
| hardened(noun, adjective, hard, indifferent, unfeeling) |
| imbecile(adjective, dull, simple, silly, foolish) |
| impassible(hard, insensitive, unsusceptible) |
| impenetrable(adjective, hard, unfeeling, unsympathetic, prepared) |