Inexhaustible means in supply that can never be used up. Inexhaustible patience, an inexhaustible supply, seemingly inexhaustible.
It is nearly always an exaggeration and is used most of energy and patience, where the point is admiration rather than accuracy. Seemingly inexhaustible is the honest form.
1adjectiveinexhaustibleIn supply that can never be used up.
“The sea was once thought to be an inexhaustible source of fish.”
inexhaustible is a quality.
From in- + exhaustible.
Etymology from Wiktionary, CC BY-SA