What does "no matter what" mean?

Regardless of, in spite of, whatever.

No matter what

Common synonyms include: anything soever which, au contraire, by no means, far from it, god forbid, however.

phrase

phrase ·Rare ·Advanced level

Phrase

1
Regardless of, in spite of, whatever.
"I'm going running tomorrow no matter what the weather is doing."
2
Regardless; in any case; even in adverse circumstances.
"This project will be finished by July no matter what."

"I'm going running tomorrow no matter what the weather is doing."