Inexhaustible (adjective)

Impossible to exhaust or use up completely.

Origin:

From in- (not) + exhaust (to draw out, use up) + -ible (able to be).

Examples:

1. The well seemed to be inexhaustible, providing an endless supply of fresh water.
2. The teacher"s patience was inexhaustible, she never seemed to get tired of answering the students" questions.
3. The universe is an inexhaustible source of inspiration for science fiction writers.
4. The amount of work required for this project seems inexhaustible.
5. The love between the mother and child is inexhaustible, it never runs out.