| feeble(adjective, weak, delicate, ill, inadequate) |
| feeling faint |
| feeling rotten(expression, infirm, poorly) |
| feeling something terrible(expression, idiom) |
| feeling terrible(expression, infirm, poorly) |
| felled |
| flimsy(adjective, weak, delicate, ill, inadequate) |
| frail(adjective, weak, delicate, ill, sick) |
| frazzled |
| got the bug(expression, idiom, infirm, poorly) |
| halting(adjective, weak, delicate, ill, sick) |
| ill-adapted(adjective, inadequate, useless, inappropriate, unhealthy) |
| ill-equipped(adjective, inadequate, useless, inappropriate, unhealthy) |
| ill-suited(adjective, inadequate, useless, inappropriate, unhealthy) |
| impotent(enervated, senescent, irresilient) |
| improper(adjective, inadequate, useless, inappropriate, unhealthy) |
| in danger |
| in poor health(expression, adjective, idiom, weak, delicate) |
| inadequate(inappropriate, unhealthy, unsuitable, unlikely, unsuited) |
| inapplicable(adjective, inadequate, useless, inappropriate, unhealthy) |