1. (a.) Capable of apprehending, or quick to do so; apt; discerning.

2. (a.) Knowing; conscious; cognizant.

3. (a.) Relating to the faculty of apprehension.

4. (a.) Anticipative of something unfavorable' fearful of what may be coming; in dread of possible harm; in expectation of evil.

5. (a.) Sensible; feeling; perceptive.

afraid agitated alive all nerves all-knowing all-overish anxious anxioused up apperceptive appercipient apprehending awake aware bothered cognizant comprehending concerned conscious disquieted disturbed edgy excitable fearful foreboding frightened high-strung in a pucker in a stew in suspense insightful intelligent irritable keyed-up knowing knowledgeable mindful misgiving nerves on edge nervous nervy omniscient on edge on tenterhooks on tiptoe overanxious overapprehensive overstrung panicky perceptive percipient perspicacious perturbed prehensile qualmish qualmy quivering sagacious sensible sentient shrewd solicitous strained suspenseful taut tense troubled understanding uneasy ware wise with bated breath with muscles tense witting zealous