いかな

いかな【如何な】

1 〔どんな〕 any (kind of)…; whatever…; (not) even.

●いかな名人でもこれ以上の細工は難しかろう. I can't imagine that anyone, however skilled they were, could do [have done] a finer job (than this). | I don't think there's a master craftsman who could do [have done] a better job.

・いかな酒飲みも君との飲み比べはご免だってよ. However much they like their drink, there's no one who'd want to compete with you. | Not even a big-time boozer would have a drinking match with you.

2 〔(否定を伴って)何としても〕 ＝どうしても.