a.
1.
Perceptible ( by any of the senses or by the mind ), apprehensible, that makes an impression.
2.
Cognizant, observant, aware, conscious, convinced, persuaded, satisfied.
3.
Judicious, wise, discreet, sage, sagacious, reasonable, intelligent, rational, sober, sound, understanding.
4.
Sensitive.
5.
Impressible.