是非 ぜひ
zehi

Adverb

1. certainly; without fail

「キャッチボールしようか」「よし、是非 ぜひやろう」
"kyacchibōru shiyōka" "yoshi zehi yarō"
"How about playing catch?" "Sure, why not?"
Noun

2. right and wrong; pros and cons

Other forms: