| knowing(adjective, sensible, familiar, knowledgeable, skilled) |
| knowledgeable(adjective, sensible, familiar, skilled, aware) |
| laid low(expression, adjective, infirm, enervated, poorly) |
| learned(adjective, familiar, knowledgeable, skilled, witting) |
| observant(adjective, sensible, sympathetic, knowledgeable, witting) |
| on sick list(expression, adjective, idiom, sick, infirm) |
| on the beam(expression, adjective, idiom, sensible, sympathetic) |
| on to(expression, adjective, sensible, knowledgeable, witting) |
| out of sorts(expression, adjective, idiom, infirm, poorly) |
| peaked(adjective, infirm, poorly) |
| perceptive(adjective, sensible, familiar, knowledgeable, skilled) |
| percipient(adjective, sympathetic, familiar, knowledgeable, skilled) |
| plugged in(expression, adjective, sensible, sympathetic, familiar) |
| poorly(adjective, sick, failing, infirm, unwell) |
| practiced(adjective, familiar, knowledgeable, skilled, aware) |
| proficient(adjective, familiar, knowledgeable, skilled, aware) |
| queasy(adjective, infirm, poorly) |
| rotten(adjective, infirm, poorly) |
| run-down(adjective, infirm, poorly) |
| running temperature(expression, adjective, infirm, poorly) |