Something with a literary heritage for your Sunday morning.

quixotic (quix·ot·ic): / kwik SOT ik /
adjective

(1) extravagantly romantic; overly chivalrous
(2) marked by a rash, lofty idealism, often to the extent of being foolish; impractical; visionary
(3) capricious; impulsive; rashly unpredictable

[Formed from the name of Don Quixote, Miguel de Cervantes’ hero in the book Don Quixote.]

Usage: Of all the hasty promises made by the quixotic, none is more likely to be broken than “I will never hurt you.”