| indiscernible(adjective, knowledge, imperceptible) |
| microscopic(adjective, slight, small, limited, unimportant) |
| trifling(adjective, light, slight, small, insignificant) |
| unobservable(adjective, knowledge, imperceptible) |
| atomic(slight, small, unimportant, commonplace, smallness) |
| imponderable(adjective, knowledge, imperceptible) |
| paltry(adjective, light, slight, small, miserable) |
| unnoticeable(adjective, knowledge, imperceptible) |
| worthless(adjective, light, slight, small, insignificant) |
| corpuscular(smallness, littleness) |
| inconspicuous(adjective, imperceptible) |
| insufficient(adjective, slight, insignificant, limited, unimportant) |
| meager(adjective, light, weak, slight, poor) |
| molecular(smallness, littleness) |
| petty(adjective, light, slight, small, insignificant) |
| piddling(adjective, slight, small, unimportant) |
| subtle(adjective, slight, small, miserable, inadequate) |
| embryonic |
| indifferent |
| indistinct(adjective, imperceptible) |