| insubstantial(adjective, value, negative, insignificant, unimportant) |
| irresolute(adjective, open, uncertain, nervous, doubtful) |
| light(adjective, weak, pale, subtle, faded) |
| moot(adjective, uncertain) |
| unknown(adjective, characteristic, clear, rough, anxious) |
| veiled |
| wispy |
| abstruse(adjective, obscure, difficult, uncertain, doubtful) |
| blank(adjective, value, negative, insignificant, unimportant) |
| capricious |
| changeable(adjective, uncertain, doubtful, hesitant, unsure) |
| distracted(adjective, ignore, careless, forget, apathetic) |
| drab(adjective, dull, dark, gloomy, dim) |
| dusky(adjective, dull, obscure, dark, gloomy) |
| elusive(adjective, false, subtle, hazy, insubstantial) |
| empty(adjective, dull, value, negative, insignificant) |
| erratic(adjective, ignore, forget, absent) |
| evasive(adjective, uncertain, careful, doubtful, deceitful) |
| impalpable(adjective, clear, definite, unclear, subtle) |
| impenetrable(adjective, opaque) |