The library contains innumerable ancient manuscripts.She's known for her innumerable acts of kindness.He faced innumerable challenges on his journey.
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Antonyms:
Endless
/ˈendləs/
Something that has no end or limit
Examples:
An endless humming of helicopters filled the darkening air.There were no lost days, no endless bouts of drinking.There were endless legal adjustments that required her presence.
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Antonyms:
Ways to tell them apart:
Innumerable implies a quantity so vast that it cannot be counted.
Endless suggests something that has no end or limit in extent or time.
Think of innumerable for large numbers, like stars in the sky.
Use endless when you would describe limitless possibilities or times, like an endless summer.
Both terms suggest abundance, but in slightly different contexts.