with all due respect
formally blunt
the one-line answer
A slightly more formal version of respectfully, often preceding a harsh opinion.
With all due respect is borrowed from formal settings and used ironically. The due respect is rarely substantial. The content usually follows without any.
mainstream
Your coworker might use this word.
01 / in the wild
hear it move.
critique
with all due respect, that plan will not work.
I am about to tell you this will fail, framed politely.