pre-noun adjectival
Emphasizes that someone is thoroughly something, often a beginner, amateur, or layperson. Used in set phrases like ずぶの素人 (complete amateur) or ずぶのしろうと.
See also: ずぶ
彼はずぶの素人だから、あまり期待しないでください。
He's a complete amateur, so please don't expect too much.
ずぶのしろうとでも、この道具を使えば簡単にできます。
Even a total beginner can do it easily with this tool.