No. Fathom means understand, but brazen means bold, they're not even synonymous.
No
Brazen is an adjective.
My father is very brazen.
"I do not fathom what you are talking about." "The water is one fathom deep."
The Brazen bull was unstoppable
The duration of The Brazen Bull is 1.42 hours.
The duration of The Brazen Beauty is 3000.0 seconds.
Perillus invented the Brazen bull.
the little girl was so brazen of her brother.
The Brazen Beauty was created on 1918-09-09.
The noun form for the adjective brazen is brazenness. The noun form for the verb brazen is the present participle, a gerund (verbal noun), brazening.
In the Belly of the Brazen Bull was created on 2012-05-07.