lone‧ly S3 comparative lonelier, superlative loneliest
unhappy because you are alone or do not have anyone to talk to [= lonesome American English] ! Do not use lonely to mean 'without anyone else'. Use alone: She is afraid to travel alone (NOT travel lonely).
a lonely old man
Don't you get lonely being on your own all day?
a lonely experience or situation makes you unhappy because you are alone or do not have anyone to talk to:
a lonely journey
He led a lonely life with few friends.
people who are lonely
a lonely place is a long way from where people live and very few people go there [= lonesome American English; = remote, desolate]
—loneliness noun [uncountable]