Like pride, "deceit" is something we see much more easily in others.
To be sure, deceit is a very grave sin in others and we are to be constantly on guard against deception. Satan himself is the great deceiver. However, like pride, our biggest problem with deceit is self-deception.
Deceit comes from the root to grasp, hold, catch, ensnare. It has the sense of to "catch in a trap" (The Roots of English). Or to catch by guile or to get the better of by fraud. Deceit is the action or practice of deceiving, the concealment of the truth in order to mislead, deception, fraud, cheating, false dealing.