| thorough(complete, sensible, thoughtful, sober, wise) |
| timid(adjective, delicate, modest, humble, careful) |
| unadventurous(adjective, careful, sure, safe, prudent) |
| undivided(adjective, whole) |
| upright(adjective, close, correct, firm, honest) |
| wakeful(adjective, keen, sharp, alert, careful) |
| well-judged(sensible, wise, shrewd) |
| wide-awake(adjective, keen, sharp, bright, lively) |
| Argus-eyed |
| acceptable(adjective, moderate, honest, fair, proper) |
| accurate(adjective, close, correct, reasonable, sensible) |
| active(sharp, bright, lively, alert, attentive) |
| acute(keen, smart, careful, clever, subtle) |
| adroit(smart, shrewd, clever, subtle, artful) |
| affectionate(adjective, close, correct, firm, honest) |
| agog(keen, alert, careful, attentive, watchful) |
| alive |
| all there(expression, sound, reasonable, sensible, intellectual) |
| allegiant(adjective, close, correct, firm, honest) |
| ambiguous |