Unknowing, unaware

Test No. [color=blue]incompl/advan-3 “Credit Card Holders”, question 4

I was totally of the increased taxes.

(a) unknowing
(b) unclear
© incredulous
(d) unaware

Test No. [color=blue]incompl/advan-3 “Credit Card Holders”, answer 4

I was totally unaware of the increased taxes.

Correct answer: (d) unaware

Dear Alan! Why can I not use “unknowing” instead of “unaware”?
Thanks

Spiderman

Hi,

Can you give me the full sentence please?

Alan

I was totally unaware of the increased taxes.
Spiderman

Hi,

Unknowing is not used with a preposition usually and is very often used in the sense of ‘innocent’ or ‘ignorant’ in a predicative sense. More commonly it is used in the adverb form ‘unknowingly’ as in ‘do something unknowingly’ means ‘do it without realising that you are doing it.’

Alan

Thank you Alan
Spiderman