Alone

Alone: Only or without any others

Usage:
She alone must decide what to do (= no one else can do it for her).
These facts alone (= even if nothing else is considered) show that he’s not to be trusted.
He won’t get the job through charm alone (= he will need something else).
The airfare alone would use up all my money, never mind the hotel bills.
Price alone is not a reliable indicator of quality.