| illimited |
| indecisive(doubtful, vague, unsure) |
| insecure(adjective, unreliable, treacherous) |
| irresolute(doubtful, vague, hesitant, changeable, unsure) |
| jumbo(adjective, huge, vast, massive) |
| mammoth(adjective, huge, vast, immense, massive) |
| monumental(adjective, huge, vast, immense, massive) |
| mysterious |
| no end to(expression, adjective, idiom, constant, monotonous) |
| precarious(adjective, unreliable, insecure, treacherous) |
| precious(adjective, rare, invaluable, immeasurable, inestimable) |
| questionable(adjective, unreliable, insecure, treacherous) |
| stupendous(adjective, absolute, huge, vast, endless) |
| sumless |
| unending(adjective, constant, monotonous, vast, endless) |
| unknowable(uncertain, unpredictable, unexpected) |
| unrestricted |
| valuable(adjective, rare, precious, invaluable, immeasurable) |
| wavering(doubtful, vague, hesitant, changeable, unsure) |
| without measure(expression, idiom, infinity) |