- tired out; physically exhausted; without energy
- used up; worn out; without power
- exhausted of sperm or spawn
- Having been put to use and therefore unavailable for use: spent shell casings.
- Depleted of energy, force, or strength; exhausted: spent laborers.
- Depleted or nearly depleted of fissionable material: spent nuclear fuel.
- Simple past tense and past participle of spend.