Next-level

adj.capable, energeticplayful

What it means

Exceptionally good or more advanced than what came before.

Reach for it when giving informal praise for a clear step above an already familiar standard

The accessibility improvements made the visitor experience feel next-level.

playful
game-changing
when the improvement alters what is possible
not when It is much stronger and often empty marketing for a modest upgrade.
warm
outstanding
when performance stands well above peers or expectations
not when Outstanding is formal praise and lacks next-level's sense of advancement.
professional
advanced
when capability rather than excitement matters
not when Advanced can be merely technical and not unusually good.
professional
exceptional
when formal praise needs a defensible high standard
not when Exceptional says nothing about progression from an earlier level.
professional
top-tier
when ranking among the best is supportable
not when Top-tier describes position, not movement to a higher level.
formal
superior
when a comparison has evidence
not when Superior invites a direct comparison and can sound arrogant without one.
literary
elevated
when refinement has raised the quality
not when Elevated can sound pretentious and may refer to tone rather than performance.

next-level performance
Her next-level performance combined speed with careful judgment.
next-level service
Clear follow-up turned good support into next-level service.
feel next-level
The quieter cabin makes the revised train feel next-level.

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