Definition of “lonely” - English Dictionary

(Definition of “lonely” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“lonely” in American English

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us /ˈloʊn·li/

(of someone) feeling sad because you are alone, or (of something) causing this feeling:

a lonely child
my lonely room

A lonely place has no people, buildings, etc.:

a lonely and deserted road
noun [ U ] us /ˈloʊn·li·nəs/

Some elderly people live in isolation and loneliness.

(Definition of “lonely” from the Cambridge Academic Content Dictionary © Cambridge University Press)