| bass(adjective, sound, intense, sounds, throaty) |
| difficult(adjective, hard, severe, meaning, abstract) |
| full(adjective, clear, strong, open, smooth) |
| inscrutable |
| insidious(adjective, smooth, sharp, cunning, tricky) |
| sincere(adjective, great, warm, energetic, enthusiastic) |
| subtle(adjective, quiet, delicate, complex, cunning) |
| thick(adjective, rough, large, fat, dense) |
| wise(adjective, characteristic, good, reasonable, keen) |
| abysmal(adjective, down, surface, extent, far) |
| cryptic(adjective, hard, evil, obscure, humble) |
| depth(noun, high, hole, hollow, gap) |
| hidden(adjective, hard, evil, obscure, complex) |
| impenetrable(adjective, set, obscure, solid, heavy) |
| incomprehensible |
| intimate(adjective, property, secret, private, personal) |
| knowing(adjective, sharp, smart, bright, intelligent) |
| learned(adjective, thoughtful, meaning, moral, knowledgeable) |
| sharp(adjective, strong, light, keen, smart) |
| wide(adjective, hard, down, thick, huge) |