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mental
/ˈmɛntəl/
When used to describe the mind (like "mental health"), the word is neutral and standard in all contexts. In British English, using "mental" to mean "crazy" or "wild" is very common as a slang term. Be careful using this meaning in formal settings, as it can be seen as insensitive or overly casual. Avoid using "mental" as a noun; it is almost always used as an adjective to describe a person, state, or process.
💬Casual Conversation
I'm thinking of banning all chairs to foster a more fluid spiritual energy.
That is absolutely mental. Please don't.
Meanings
Relating to the mind or intellectual process.
"Mental arithmetic is a useful skill for daily life."
Suffering from a mental illness; unstable.
"He was struggling with his mental health after the accident."