Class act

n.kind, thoughtfulwarm

What it means

A person admired for gracious, honorable, and consistently excellent conduct.

Reach for it when offering informal praise for character shown in a revealing moment

Rosa was a class act, thanking the temporary crew before accepting her award.

playful
mensch
informal praise for decency and reliability suits the cultural context
not when Mensch is borrowed from Yiddish and may feel affected outside communities that use it naturally.
everyday
standout
someone rises above peers in a favorable way
not when Standout can refer to talent or appearance without saying anything about character.
warm
gracious winner
dignity after success is the specific praise
not when This phrase cannot describe someone who behaved well after losing or during conflict.
professional
role model
others can learn from the person's repeated conduct
not when Role model creates an ongoing public burden that one class act need not carry.
professional
true professional
skill and conduct meet a high workplace standard
not when Professionalism is too narrow when the admired act occurs outside work.
formal
exemplary person
conduct clearly deserves to be copied
not when Exemplary person is stiff and may claim excellence across an entire life.

real class act
The opposing captain was a real class act throughout the appeal.
remain a class act
He managed to remain a class act after the decision went against him.
total class act
Calling every volunteer by name made her a total class act in their eyes.

Class act is informal and evaluates a person broadly; name the specific conduct when precision matters.

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