怎能 is an adverbial phrase expressing strong rhetorical disbelief or impossibility — literally 'how can' or 'how could'. It combines 怎 (zěn), meaning 'how', and 能 (néng), meaning 'can' or 'be able to'. Together, they form a fixed expression used to emphasize that something is unthinkable, unacceptable, or logically impossible in the speaker’s view. It always appears at the beginning of a clause or sentence and is followed by a verb phrase, often with a negative implication — even when no explicit negation (e.g., 不) appears, the tone itself conveys rejection or incredulity.

This phrase carries emotional weight and is common in spoken and written Chinese, especially in persuasive, literary, or expressive contexts — such as expressing sorrow, moral objection, or deep admiration. It is more formal and emphatic than simpler alternatives like 怎么可能 or 怎么会, and it frequently appears in classical-influenced modern prose, speeches, and song lyrics. Its rhetorical force makes it unsuitable for neutral factual statements or casual yes/no questions.