grinning
She grinningly referred to the slogan as a vitally important message.
These are the people who over the years have grinningly condoned the demise of major industries in these areas.
As they will grinningly tell you, life is not usually like that.
His assistants grinningly demonstrate what he is saying.
She was grinningly self-effacing and eager to please.

SMART Vocabulary: related words and phrases

Laughing and smiling
a gleam in your eyeidiom
amused
be all smilesidiom
be in convulsionsidiom
be rolling in the aislesidiom
be wreathed in smilesidiom
burst
crease
dissolve
gale
giggle
giggler
gigglingly
giggly
piss yourself (laughing)idiom
quake
rictus
say cheeseidiom
simper
smile