adverb
Used adverbially, often in the form ずぶの, to emphasize that something is thorough or extreme. Commonly appears in fixed expressions like ずぶの素人 (complete amateur).
See also: ずぶの
彼はずぶの素人だから、あまり期待しないで。
He's a complete amateur, so don't expect too much.
ずぶのしろうとでも、このゲームならすぐに楽しめる。
Even a total beginner can enjoy this game right away.