"Overconfidence" is a word in ENGLISH

overconfidence ENGLISH
Definition:

Excessive confidence; too great reliance or trust.

Few words of positivity

The first duty of a lecturer- to hand you after an hour's discourse a nugget of pure truth to wrap up between the pages of your notebooks and keep on the mantelpiece for ever.

Virginia Woolf

WORD SUGGESTIONS
Laugh your heart out.

What does Father Christmas call his money ?Iced lolly ?

confidence ENGLISH

Having an excess of assurance; bold to a fault; dogmatical; impudent; presumptuous.

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overconfident ENGLISH

Confident to excess.

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overtrust ENGLISH

Excessive confidence.

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