| enfeeble(upset, depress, extinguish, dishearten, undermine) |
| ennui(verb, worry, fail, strain, annoy) |
| exasperate(verb, worry, fail, strain, annoy) |
| excrete(verb, waste) |
| exhaust(verb, fail, strain, annoy, drain) |
| fag(verb, worry, fail, strain, annoy) |
| fail(verb, strain, annoy, irritate, exhaust) |
| faint(verb, fail, strain, annoy, irritate) |
| fatigue(verb, worry, fail, strain, annoy) |
| faze(verb, upset, dull, reduce, disturb) |
| flag(verb, fail, strain, annoy, exhaust) |
| flatten |
| fold(verb, fail, strain, annoy, irritate) |
| foul |
| fright |
| get to(expression, upset, depress, extinguish, undermine) |
| give out(verb, expression, worry, fail, strain) |
| go stale(verb, expression, worry, fail, strain) |
| grow weary(verb, expression, worry, fail, strain) |
| harass(verb, worry, fail, strain, annoy) |