| monotonous(constant, abundant, unrestrained, endless, immense) |
| monstrous(huge, vast, immense, massive, ineffable) |
| never-ending(adjective, constant, absolute, abundant, unrestrained) |
| no catch(expression, adjective, endless, immense, infinite) |
| no holds barred(expression, adjective, idiom, endless, immense) |
| no strings(expression, adjective, complete, unrestrained, endless) |
| no strings attached(expression, adjective, idiom, endless, immense) |
| nondurable(adjective, unreliable, insecure, treacherous) |
| numerous |
| obscure |
| out-of-bounds(adjective, rare, precious, invaluable, inestimable) |
| out-of-sight(rare, precious, invaluable, inestimable, irreplaceable) |
| overlong(constant, abundant, unrestrained, endless, immense) |
| polysemous |
| pregnable(adjective, unreliable, insecure, treacherous) |
| prized(adjective, rare, precious, invaluable, inestimable) |
| puzzling |
| rare(adjective, precious, invaluable, inestimable, irreplaceable) |
| rich(adjective, rare, precious, invaluable, inestimable) |
| risky(doubtful, vague, dubious, unsure, hazardous) |