ETYM Latin languidus, from languere to be faint or languid: cf. French languide. Related to Languish.
1. Drooping or flagging from exhaustion; indisposed to exertion; without animation; weak; weary; heavy; dull.
2. Slow in progress; tardy.
3. Promoting or indicating weakness or heaviness.

Ready to fall asleep; SYN. sleepy-eyed, sleepyheaded.

Depleted of strength or energy

1. Having the strength exhausted by labor or exertion; worn out in respect to strength, endurance, etc.; tired; fatigued.
2. Causing weariness; tiresome.
3. Having one's patience or contentment exhausted; tired; sick; SYN. fatigued, tiresome, irksome, wearisome.