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完全不知道

have no idea at all

→ 完全
phrase Rare #21,095
have no idea at all 完全 adds emphasis to 不知道, meaning that the speaker really does not know.
CH: 我完全不知道他去哪儿了。
EN: I have no idea where he went.

完全不知道啊

I have absolutely no idea.

— 真爱至上 (2003)

他完全不知道是怎么回事

He has absolutely no idea what's going on.

— 智利说不 (2012)

所以你完全不知道画家是谁？

So you have no idea who the painter is?

— 痛苦与荣耀 (2019)