随便
suíbiàn
casual; as you please; whatever
adverb/adjective
Example
今天晚饭吃什么？随便，你决定吧。
Jīntiān wǎnfàn chī shénme? Suíbiàn, nǐ juédìng ba.
What should we eat for dinner tonight? Whatever, you decide.
A versatile word that can mean 'casual/informal' when describing behavior or clothing, or 'whatever/as you like' when expressing indifference to choices. Very commonly used in daily conversation.