optimistake 

A situation that goes wrong due to your mistakes because you expressed way too much optimism than it deserved.

I sense that this deal could go wrong with our optimistake behavior, let's be careful.

optimistake by sgrbn May 28, 2018

optimista 

is an outlook on life with a Latin twist. One maintains a view of the world as a positive place.

Opposite:
Pessimista

Tia was being optimista that she would find the perfect dress for her sister's wedding

optimista by Tia&Chele April 22, 2008

Optimistamania 

Excessive excitement or enthusiasm, craze for an optimist or optimistic person or to have mania for optimism.

I've come down with a severe case of optimistamania and I love it!

Optimistamania by Mistymeanor February 20, 2011

optimistaken 

To be optimistaken is to be optimistic and mistaken about something at the same time.

Engineers are often optimistaken about their schedules.

optimistaken by swerdna May 21, 2017