I've extended a friendly,
CASUAL greeting.
The Big Bang Theory Season 3, Episode 10
I'm striking up a CASUAL conversation
with you.
The Big Bang Theory Season 2, Episode 9
There's a difference
between CASUAL and weird.
The Big Bang Theory Season 11, Episode 8
Of course, the CASUAL mention
of a Dothraki horde,
Game of Thrones Season 7, Episode 2
...and engage in CASUAL physical contact...
The Big Bang Theory Season 6, Episode 1