‘发愣’ is a verb meaning to space out, zone out, or stare blankly—often due to surprise, confusion, boredom, or deep thought. Literally, ‘发’ (fā) means ‘to emit’ or ‘to enter into a state’, and ‘愣’ (lèng) means ‘dazed’ or ‘stunned’. Together, they describe the sudden onset of mental stillness: the mind goes quiet, the eyes glaze over, and the person becomes temporarily unresponsive to their surroundings. It’s commonly used in informal spoken and written Chinese, especially to depict brief, involuntary lapses in attention.

This expression carries a neutral-to-slightly-negative connotation—it suggests mild distraction or emotional pause, not serious impairment. You’ll hear it describing someone who freezes mid-conversation after shocking news, or a student staring blankly at an unsolved math problem. Unlike more clinical terms, ‘发愣’ emphasizes observable behavior: vacant eyes, slack posture, delayed reactions—and it’s almost always momentary, not prolonged.