pre-noun adjectival
what kind of; what sort of; what
Pre-noun adjectival (rentaishi) used to ask or describe the nature or type of something. Formal/literary equivalent of どんな.
No matter what the reason, violence is not acceptable.
Nobody knows what kind of person he is.
pre-noun adjectival
Used in constructions like いかなる...でも/も to mean 'no matter what kind of...' or 'any...'. Emphatic and formal.
We will advance without giving in to any difficulties.
In any case, this rule must be observed.
No matter what happens, I will not give up.
Everyone is equal before the law, no matter who they are.
I want you to think carefully about what kind of meaning this holds.