Fool is a countable noun and refers to a person who lacks good judgment; a silly or stupid person: ‘You are making yourself look like a fool.’
The adjective is foolish:  ‘It was foolish of me to lend him money.’ ‘A foolish decision can ruin everything.’

English 
Chinese
Japanese
Korean![Validate my RSS feed [Valid RSS]](http://feedvalidator.org/images/valid-rss-rogers.png)

