| bottomless(adjective, complete, deep, absolute, immense) |
| erratic(adjective, doubtful, dubious, unpredictable, changeable) |
| eternal(adjective, constant, absolute, abundant, unrestrained) |
| multitudinous(adjective, abundant, endless, immense, infinite) |
| no end of(expression, adjective, idiom, constant, monotonous) |
| termless(adjective, infinite, infinity) |
| titanic(adjective, huge, vast, immense, massive) |
| unfixed(adjective, uncertain, doubtful, hesitant, changeable) |
| unknown |
| unsure(adjective, unreliable, insecure, treacherous) |
| whimsical(adjective, irregular, dubious, unreliable, changeable) |
| dicey(adjective, irregular, dubious, unreliable, changeable) |
| dubious(adjective, unreliable, insecure, treacherous) |
| everlasting(adjective, constant, absolute, abundant, unrestrained) |
| exhaustless |
| fluky(adjective, uncertain, chance, unpredictable, changeable) |
| incomprehensible |
| invaluable(adjective, rare, precious, immeasurable, inestimable) |
| massive(adjective, huge, vast, endless, immense) |
| prodigious(adjective, huge, vast, immense, massive) |