adj.1 infinite; without end; eternal.
2 continual, incessant (tired of their endless complaints).
3 colloq. innumerable.
4 (of a belt, chain, etc.) having the ends joined for continuous action over wheels etc.
Phrases and idioms:
endless screw a short length of screw revolving to turn a cog-wheel.
Derivatives:
endlessly adv. endlessness n.
Etymology: OE endeleas (as END, -LESS)