ability to let things slide; power to not get worked up
Colloquial term for the mental skill of ignoring minor annoyances, criticism, or bad luck without getting upset. Often used in self-help or casual conversation.
Instead of reacting to every nasty comment online, let's develop the ability to let things slide.
He has a strong ability to brush things off, so he doesn't get rattled by minor troubles.
Blend of the loanword スルー (from English 'through', meaning to ignore or pass over) and 力 (ちから/りょく, 'power' or 'ability').