HMMMM...
偽善的な	15469	50.7%
偽善の	15039	49.3%


偽善的な態度	354	100.0%
偽善的の態度	0	0.0%

偽善的なこと	747	95.5% <-- hypocritical things
偽善のこと	35	4.5%  <-- about hypocrasy

偽善的な言葉	457	57.7%  <-- "hypocritical speech"
偽善の言葉	165	20.8%  <-- the word "hypocrisy" maybe, sometimes

偽善的な行動	133	16.8%  <-- hypocritical actions
偽善の行動	37	4.7%　　<-- defining what hypocrisy means? eh.

Changed nothing.

I said on another edit I was going to drop [adj-no] here.  I think 的 is the safe usage (eijiro backs this up 100%), but there seems to by plenty of の usage in the wild, and I did get a reference for it:

https://kotobank.jp/esjaword/hipocrita
小学館 西和中辞典 第2版
[形] 偽善的な，偽善の．
All example sentences used 的. 的 is bold, の is not.

I think that の results are at least inflated by coincidental usage. Such as:
こと example (not adj-no here, I don't believe):
それは彼らの偽善のことです