| A | B |
| audible | capable of being heard; loud enough to be heard |
| inaudible | incapable of being heard; not audible |
| comprehensible | capable of being comprehended (understood); understandable; intelligible |
| incomprehensible | not understandable; unintelligible |
| feasible | capable of being done or accomplished; possible; practicable; workable |
| unfeasible | not feasible; impracticable; unworkable |
| tangible | capable of being touched of felt by touching; palpable; real; actual |
| intangible | incapable of being touched; not tangible; impalpable |
| visible | capable of being seen; perceptible; evident |
| invisible | incapable of being seen; not visible; imperceptible |