Word To Use Today: deluded.

 Now here's a word with an interesting derivation.

Word To Use Today: deluded. This word comes from the Latin dēlūdere, which means to mock or pay false, from lūdere, which means to play.

Nowadays, of course, deluded describes someone whose mind is full of false notions. It also contains the idea that he or she has been deceived deliberately.

Such delusion is often self-inflicted, often because of some mental incapacity.