adjective

countless

countless, innumerable, myriad

There are countless stars in the night sky.

There are countless stars in the night sky.

He made countless mistakes on the test.

He made countless mistakes on the test.

((countless)) ((noun)) modifying a plural noun to mean 'very many' There are countless reasons to learn English.

Synonyms: innumerable, myriad, infinite; Antonyms: few, limited, countable

From 'count' + the suffix '-less' meaning 'without'. Literally, 'without being able to be counted'.

Think of the countless stars in the sky; you can't count them all.

This page is designed for learning support. Please use it as a learning reference, not as a formal reference.