(adj): characterized by ease and quickness in perceiving
(adj): mentally acute or penetratingly discerning
(adj): perceiving the significance of events before they occur
(adj): unobtrusively perceptive and sympathetic
(adj): vs. tactless) -- (having or showing a sense of what is fitting and considerate in dealing with others
(adj): quick to understand
(adj): vs. unperceptive) -- (having the ability to perceive or understand; keen in discernment
(adj): able to make or detect effects of great subtlety; sensitive
(adj): vs. undiscriminating) -- (showing or indicating careful judgment and discernment especially in matters of taste
discern
(v): detect with the senses