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.
いかなる理由があっても、暴力は許されない。
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.
いかなる困難にも負けずに前進する。
We will advance without giving in to any difficulties.
いかなる場合でも、この規則は守らなければならない。
In any case, this rule must be observed.