惕

Denotes a state of mental apprehension. This ranges from acute visceral reactions (alarm, being startled, or sudden fear) to sustained states of disciplined readiness (vigilance and watchfulness in response to a perceived threat).

Primarily functions as a stative verb or adjective describing a mental state. In the imperative, it emphasizes maintaining a state of readiness ("stay alert"). It may also appear in causative contexts where an external stimulus puts the subject "on edge."

Contrast with 慎 (shèn): while both involve "care," 慎 typically refers to propriety and the avoidance of error through deliberation; 惕 is more reactive and tied to survival or danger. Contrast with 恐 (kǒng) and 惧 (jù): these denote broader states of fear or dread, whereas 惕 specifically denotes the focused alertness produced by that fear.

Fanqie reading: 他歷; Tang-period reading: tek. The form U+6090 is a graphical variant of the phonetic component reflecting scribal habit or manuscript tradition; there is no evidence that this shift alters the meaning.