If someone calls you perceptive, they mean you are good at understanding things or figuring things out. Perceptive people are insightful, intelligent, and able to see what others cannot.
Perceive means "to see"; so, perceptive is a word to describe someone who is good at seeing. Perceptive is derived from the Latin word percipere which means "to obtain or gather." A perceptive person is good at gathering information and using her senses to take in the world. If you are upset but trying to hide it, a perceptive person is the one who will notice.
adj of or relating to perception
adj having the ability to perceive or understand; keen in discernment
acute, discriminating, incisive, keen, knifelike, penetrating, penetrative, piercing, sharp
having or demonstrating ability to recognize or draw fine distinctions
quick to understand
able to relate new percepts to past experience
exhibiting insight or clear and deep perception
quick to notice; showing quick and keen perception
quick-sighted, sharp-eyed, sharp-sighted
keenly perceptive or alert
able to make fine distinctions
characterized by understanding based on comprehension and discernment and empathy