乐观
lè guān
optimistic, positive
adjective
Example
她总是很乐观，相信一切都会好起来的。
Tā zǒngshì hěn lè guān, xiāngxìn yīqiè dōu huì hǎo qǐlái de.
She is always very optimistic and believes that everything will get better.
乐观 literally means 'happy view' - combining 乐 (happy/joy) and 观 (view/perspective). The opposite is 悲观 (bēi guān) meaning pessimistic. This word is commonly used to describe someone's personality or outlook on life.