You start- which do you think is right and why?

Student or Learner
Hello
which word is right and why please ( explain it grammatically )?
[ Failing - Fail ] to clarify your purpose is a common mistake with persuasive message.??
thank you so much
You start- which do you think is right and why?
That sound very unnatural to me. If I were such a person, I would be more likely to say:My next failing is that I am weak to tall, have-more-fun blondes.
My next failing is that I have a weakness for tall, fun-loving blondes.
In my dictionary, I've seen different types of blondes such as peroxide blondes, platinum blondes, etc.
How, in general, to say for women that naturally have black hair which is painted to yellow.
Non-natural blondes, maybe?
Thanks
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