| no can do(weak, skill, inadequate, unfit, inept) |
| no good(weak, skill, inadequate, unfit, inept) |
| not able(weak, skill, inadequate, unfit, inept) |
| not cut out for(weak, skill, inadequate, unfit, inept) |
| not equal to(weak, skill, inadequate, unfit, inept) |
| not strong(expression, adjective, weak, uncertain, feeble) |
| not up to(weak, skill, inadequate, unfit, inept) |
| out of commission(expression, weak, skill, unfit, inept) |
| out of gas(expression, adjective, idiom, weak, uncertain) |
| paralyzed |
| rickety(adjective, uncertain, feeble, shaky, hesitant) |
| rocky(adjective, uncertain, feeble, shaky, hesitant) |
| rotten(adjective, uncertain, feeble, shaky, hesitant) |
| senile(adjective, uncertain, feeble, shaky, hesitant) |
| shaky(adjective, uncertain, feeble, hesitant, sluggish) |
| sickly(adjective, uncertain, feeble, shaky, hesitant) |
| sidelined(weak, skill, inadequate, unfit, inept) |
| skill(weak, inadequate, unfit, inept, powerless) |
| spindly(adjective, uncertain, feeble, shaky, hesitant) |
| tender(adjective, uncertain, feeble, shaky, hesitant) |