(ONLY) [adjective] [after noun; not gradable] - only or without any othersShe alone must decide what to do (= no one else can do it for her).It's Jane, and Jane alone, who can help you out of this mess.These facts alone (= even if nothing else is considered) show that he's not to be trusted.You won't get the job through charm alone (= you will need something else).The airfare alone would use up all my money (= even if there was nothing else to pay for), never mind the hotel bills.Price alone is not a reliable indicator of quality.
ALONE
Meaning of ALONE in English
Cambridge English vocab. Кембриджский английский словарь. 2012