- Impossible to slake or satisfy.
- Impossible to suppress or destroy.
- Not quenchable; incapable of being quenched, extinguished, allayed, or the like: as, <em>unquenchable</em> fire, thirst, etc.
- That which cannot be quenched; figuratively, one whose zeal cannot be quenched.
- That cannot be <xref>quenched</xref>.
- impossible to quench