| gloom |
| glowering(upset, dark, gloomy, hostile, misty) |
| grim humour(adjective, sorrow, depress, sadness, emotion) |
| gruff(adjective, sorrow, depress, sadness, emotion) |
| gruffy(adjective, sorrow, depress, sadness, emotion) |
| ill-looking(adjective, sorrow, depress, sadness, emotion) |
| imperceptible |
| incomprehensible(adjective, obscure, difficult, strange, uncertain) |
| inconclusive(obscure, uncertain, vague, unclear, indefinite) |
| indefinite(obscure, uncertain, vague, unclear, ambiguous) |
| indeterminate(obscure, uncertain, vague, unclear, ambiguous) |
| indiscernible |
| indistinguishable(adjective, unclear, indistinct) |
| inexplicable(unclear, indistinct, indistinguishable) |
| inexplicit(adjective, obscure, uncertain, vague, ambiguous) |
| inhospitable(adjective, sorrow, depress, sadness, emotion) |
| lackluster(adjective, dull, dark, gloomy, faint) |
| lacklustre |
| lonesome(dull, gloomy, miserable) |
| low-browed(adjective, sorrow, depress, sadness, emotion) |