不言而喻

Function word; no; not; un-; negative prefix; used to form questions or emphasize a statement; sometimes used for rhythm.

Words; speech; to say; to talk; to speak; to state; to tell; to ask.

A conjunction connecting clauses or phrases; indicates addition, contrast, or a causal relationship; also used to indicate a change of state.

To explain or inform; to know or understand; an analogy or metaphor; a surname.