also: オプチミズム
noun
A loanword from English, used in similar contexts to its English counterpart. Often appears in philosophical, psychological, or everyday positive-thinking contexts.
彼のオプティミズムは周りの人を元気にする。
His optimism energizes the people around him.
困難な状況でもオプティミズムを失わないことが大切だ。
It's important not to lose optimism even in difficult situations.
The opposite concept, 'pessimism', also a loanword from English.
Borrowed from English 'optimism'.