Meaning of “lonely” - Learner’s Dictionary

lonely

adjective uk us /ˈləʊnli/
PERSON

B1 unhappy because you are not with other people:

She gets lonely now that the kids have all left home.
PLACE

B2 A lonely place is a long way from where people live.

loneliness noun [ U ]

(Definition of “lonely” from the Cambridge Learner’s Dictionary © Cambridge University Press)