| spirited(keen, sharp, lively) |
| straining(adjective, keen, violent, anxious, eager) |
| sudden(adjective, keen, violent, anxious, eager) |
| supersensitive |
| surly(adjective, delicate, cross, short, sensitive) |
| susceptible(nervous, emotional, restless, volatile, fiery) |
| thirsty(adjective, keen, violent, anxious, eager) |
| thoughtless |
| unable(adjective, keen, violent, anxious, eager) |
| uncontrolled(nervous, emotional, restless, volatile, fiery) |
| uneasy(nervous, emotional, restless, volatile, fiery) |
| unforbearing(adjective, keen, violent, anxious, eager) |
| unindulgent(adjective, keen, violent, anxious, eager) |
| unsafe(adjective, delicate, sensitive, tricky, impatient) |
| uptight(adjective, delicate, sensitive, irritable, tricky) |
| vexed(short, faultfinding, caviling) |
| vulnerable(adjective, emotional, touchy, hypersensitive, thin-skinned) |
| wired up(expression, adjective, delicate, sensitive, tricky) |
| wound up(expression, adjective, delicate, sensitive, tricky) |
| acute(keen, sharp, lively) |