殆

• Precariousness and Danger: As an adjective, dangerous or perilous. As a verb, to endanger or bring to the brink of collapse.
• Depletion and Fatigue: Exhausted, worn out, or spent; specifically a systemic depletion of strength or resources (e.g., 疲殆).
• Probability and Approximation: Almost, nearly, probably, or likely. Often serves as a hedge to express high probability rather than certainty.

• Modal/Adverbial use: Used in argumentative or philosophical prose to indicate likelihood.
• Construction: When paired with the final particle 矣 (殆矣), it frequently functions as "it is likely so" or "it is nearly the case," shifting away from a literal sense of danger.

• vs. 危 (wēi): 危 typically denotes immediate or acute physical peril, whereas 殆 suggests precariousness and gradual failure or decline.
• vs. 幾 (jī): Both can mean "almost," but 幾 often implies a narrow miss or the threshold of an event; 殆 suggests a probable conclusion or a state nearly reached.
• vs. 疲 (pí): While both denote fatigue, 殆 emphasizes the resulting state of instability or depletion.

Distinguish first between the glyph's role as a descriptor of a state (danger/exhaustion) and its role as a modal adverb (probability). In non-narrative prose, the probability sense is frequently more prevalent than the literal sense of peril.