Looking on the internet deeply has found these results:

i would prefer not to say is the most popular phrase on the web.

i would prefer not to say something for that 10 results on the web	i would prefer not to say 11,600 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
It doesn't look like this phrase is very popular! The search could not find any examples on the internet.	What is your gender?  Male  Female  I would prefer not to say. SECTION C: ETHNIC ORIGIN. What is your ethnic group? Choose ONE section from 1 to 5, ... Jul 14, 2014 ... I would prefer not to say any more about myself. D'Artagnan (The Three Musketeers, by Alexandre Dumas) Profile Photo: Drunk with a bunch of ... Sep 26, 2014 ... We agreed not to and I would prefer not to say why," Vertonghen said, as quoted on Sky Sports. "I still have four years left. I am very happy at ... Oct 18, 2011 ... "I would prefer not to say". "Tell me a story". "Once upon a time ... no it's too silly". " Can you murder someone for me". "I found three mental ...

i would prefer not to say something for that

10 results on the web

i would prefer not to say

11,600 results on the web

More popular!

It doesn't look like this phrase is very popular! The search could not find any examples on the internet.

What is your gender?  Male  Female  I would prefer not to say. SECTION C: ETHNIC ORIGIN. What is your ethnic group? Choose ONE section from 1 to 5, ...
Jul 14, 2014 ... I would prefer not to say any more about myself. D'Artagnan (The Three Musketeers, by Alexandre Dumas) Profile Photo: Drunk with a bunch of ...
Sep 26, 2014 ... We agreed not to and I would prefer not to say why," Vertonghen said, as quoted on Sky Sports. "I still have four years left. I am very happy at ...
Oct 18, 2011 ... "I would prefer not to say". "Tell me a story". "Once upon a time ... no it's too silly". " Can you murder someone for me". "I found three mental ...