no matter
adverb
Definitions
It doesn't matter, it's unimportant, it doesn't make any difference.
Example: "Did you fail your exam?" "Yes, but no matter. I'll just study harder next time."
preposition
Definitions
Irrespective of, regardless of, in spite of ([~ + who / what / when / where / how / why]).
Example: No matter what the excuse, you must not be late