Badass

adj.capable, energeticplayful

What it means

Exceptionally tough, capable, or impressive in a forceful way.

Reach for it when giving exuberant informal praise for skill joined with nerve

Her badass repair in the final minute kept the research vessel running.

playful
hardcore
extreme commitment fits a subcultural or joking voice
not when Hardcore can sound aggressive and may be unclear outside informal groups.
everyday
tough
durability under hard conditions matters
not when Tough is flatter and may miss the flash of exceptional performance.
warm
fearless
visible freedom from fear is the main praise
not when Skill and effectiveness are not guaranteed by fearlessness.
professional
impressive
neutral admiration suits a broad audience
not when The word loses the rebellious energy carried by badass.
formal
formidable
ability or presence commands serious respect
not when Formidable can suggest intimidation rather than affectionate admiration.
formal
masterful
expert control of a difficult task deserves emphasis
not when Masterful does not convey physical toughness or defiant style.

badass leader
The badass leader carried equipment beside the newest volunteers.
badass performance
Her badass performance combined precision with complete calm.
badass move
Fixing the leak without delaying the clinic was a badass move.

Badass is slang and can be mildly profane. It is unsuitable for formal praise, children, or readers who may hear aggression rather than admiration.

The definition and the example on this page are written here. The dictionaries above ground which meaning is being described, not the wording.