| unthinking(adjective, careless, indifferent, blank, thoughtless) |
| deadpan(adjective, cold, aloof, neutral, expressionless) |
| empty-headed(adjective, full, thoughtless, expressionless, scatterbrained) |
| fatuous(adjective, thoughtless, imbecility folly) |
| thoughtless(adjective, dull, wrong, careless, indifferent) |
| absent(adjective, dull, stupid, negative, usual) |
| dull(adjective, stupid, dead, sluggish, lifeless) |
| lacking(adjective, poor, small, insignificant, unimportant) |
| spare(adjective, free, allow, let, relaxing) |
| unused(adjective, clear, new, loose, fresh) |
| vapid(adjective, dull, flat, value, silly) |
| desolate(adjective, barren, unused) |
| foolish(adjective, careless, indifferent, silly, stupid) |
| jejune(adjective, poor, small, insignificant, unimportant) |
| null(adjective, unsubstantial, nonexistent, unsubstantiality) |
| stark(adjective, clear, smooth, bare, empty) |
| untenanted(adjective, empty, absence, unoccupied) |
| glassy(adjective, expressionless, especially) |
| impassive(adjective, cold, aloof, neutral, indefferent) |
| inexpressive(adjective, dull, indifferent, dead, blank) |