| unalert(adjective, adverb, unqualified, inattentive, negligent) |
| unaware(unqualified, vulnerable, unsuspecting, suddenly, unexpectedly) |
| unequipped |
| unplanned(unqualified, unsuspecting) |
| unsuspecting(adjective, unqualified, inattentive, unprepared) |
| unwary(unqualified, unsuspecting) |
| unwatchful(adjective, adverb, unqualified, inattentive, negligent) |
| ill-considered(unqualified, vulnerable, unaware, unsuspecting) |
| aback(suddenly, unexpectedly, unawares, astonishingly, astoundingly) |
| abruptly(adverb, suddenly, unexpectedly, unawares, astonishingly) |
| accidentally(suddenly, unexpectedly, unawares, astonishingly, astoundingly) |
| ad lib |
| afraid(adjective, difficult, awkward, forced, averse) |
| against(adjective, awkward, unfriendly, contradictory, forced) |
| against the grain(expression, adjective, idiom, unfriendly, dissatisfied) |
| airy |
| apathetic(adjective, dull, careless, indifferent, idle) |
| arrested |
| asleep |
| asleep at the switch(expression, idiom, adverb, negligent, unprepared) |