愣怔 (lèng zheng) is a literary, somewhat poetic adjective describing a state of being mentally frozen—dazed, stunned, or bewildered—as if one’s thoughts have suddenly stopped. Though composed of two characters (愣 and 怔), each meaning 'to be startled' or 'to space out', they function together as a fixed reduplicative compound with no independent usage in this pairing. It conveys a momentary loss of composure or awareness, often triggered by surprise, shock, or overwhelming emotion.

This word appears frequently in classical and modern literary Chinese—especially in narrative prose and dialogue—to depict inner psychological stillness. It carries a quiet, introspective tone and is rarely used in casual speech or formal writing; instead, it evokes atmosphere and character interiority. Unlike more colloquial synonyms like 发呆 (fā dāi, 'to zone out'), 愣怔 suggests a sharper, more acute mental pause—less passive daydreaming, more reactive suspension.