Did you make the apology
as SINCERE as I would have?
The Big Bang Theory Season 9, Episode 23
And I want you to know that
that is SINCERE. I do feel bad.
The Big Bang Theory Season 9, Episode 13
Not to "Sin City" but to "SINCERE city."
The Big Bang Theory Season 9, Episode 13
I sense that's not SINCERE,
although I have no idea why.
The Big Bang Theory Season 3, Episode 11
If you're interested in making
a SINCERE effort to be a good teacher...
The Big Bang Theory Season 8, Episode 2