Adjective

• S: (adj) alone (isolated from others) "could be alone in a crowded room"; "was alone with her thoughts"; "I want to be alone"
• S: (adj) alone, lone, lonely, solitary (lacking companions or companionship) "he was alone when we met him"; "she is alone much of the time"; "the lone skier on the mountain"; "a lonely fisherman stood on a tuft of gravel"; "a lonely soul"; "a solitary traveler"
• S: (adj) alone, only (exclusive of anyone or anything else) "she alone believed him"; "cannot live by bread alone"; "I'll have this car and this car only"
• similar to
• antonym
• S: (adj) alone, unique, unequaled, unequalled, unparalleled (radically distinctive and without equal) "he is alone in the field of microbiology"; "this theory is altogether alone in its penetration of the problem"; "Bach was unique in his handling of counterpoint"; "craftsmen whose skill is unequaled"; "unparalleled athletic ability"; "a breakdown of law unparalleled in our history"

Adverb

• S: (adv) entirely, exclusively, solely, alone, only (without any others being included or involved) "was entirely to blame"; "a school devoted entirely to the needs of problem children"; "he works for Mr. Smith exclusively"; "did it solely for money"; "the burden of proof rests on the prosecution alone"; "a privilege granted only to him"
• S: (adv) alone, solo, unaccompanied (without anybody else or anything else) "the child stayed home alone"; "the pillar stood alone, supporting nothing"; "he flew solo"