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.