| inconsiderate |
| indurate(adjective, bad, cold, aloof, no feelings) |
| insouciant(adjective, cold, indifferent, dead, unsympathetic) |
| invisible(adjective, knowledge, hidden, unable) |
| iron-hearted(adjective, bad, hard, tough, severe) |
| languid(adjective, dull, quiet, flat, slow) |
| materialistic(feature, person, spirit) |
| mindless(innocent, unfamiliar, unknowing, unaware, uninformed) |
| passionless(adjective, dull, quiet, cool, flat) |
| slow(adjective, dull, quiet, flat, heavy) |
| stony(adjective, mean, hard, tough, severe) |
| unappreciative(adjective, indifferent, not aware) |
| undetectable |
| unemotional(adjective, hard, cool, tough, severe) |
| uninformed(adjective, innocent, unconcerned, ignorant, unfamiliar) |
| unkind(adjective, bad, hard, tough, severe) |
| unobservable(adjective, knowledge, imperceptible) |
| unsuspecting(adjective, innocent, ignorant, unfamiliar, unconscious) |
| unwitting(innocent, unconcerned, ignorant, unconscious, unknowing) |
| witless(adjective, innocent, unfamiliar, unknowing, unaware) |