A mountebank (person) is
Mountebank: A person who deceives others, especially in order to trick them out of their money; a charlatan.
When you have a foreboding you
Foreboding: A feeling that something bad will happen; fearful apprehension.
A parvenu person
Parvenu: A person of humble origin who has gained wealth, influence, or celebrity.
Something that cannot be gainsaid cannot be
Gainsay: [with object and negative](formal) Deny or contradict (a fact or statement)
A prowess in fishing is
Prowess: Skill or expertise in a particular activity or field.
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