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The smallest in size, amount, or importance
He was the least experienced member of the team.
He had the least experience among the team members.
Often used with 'the' to indicate the smallest degree or quantity.
To the smallest degree or extent
She cared least about the outcome.
She cared the least about the outcome.
Used as an adverb to modify verbs, adjectives, or other adverbs.
As an adjective, 'least' modifies nouns (e.g., 'the least amount'). As an adverb, it modifies verbs, adjectives, or other adverbs (e.g., 'she cared least').
'Least' is the superlative form of 'little' and 'less'. It is used to indicate the smallest degree or quantity.
From Middle English 'leste', from Old English 'lǣst', superlative of 'lǣs' (less).
Can function as an adjective, determiner, or adverb. Often used with 'the' to indicate the smallest degree or quantity.