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Impossible, unreasonable, or beyond one's ability
それは無理だ
That's impossible
無理をしないでください
Don't push yourself too hard
Often used to express that something is beyond one's capacity or unreasonable to ask
Forced or artificial (when referring to things)
無理な笑顔
A forced smile
In casual conversation, '無理' is often used to politely decline requests or express that something is too difficult.
When declining a request, saying '無理です' is more polite than simply saying 'no'.
Combination of '無' (nothing) and '理' (reason), literally meaning 'no reason' or 'unreasonable'
Can be used as a noun or adjective depending on context. Often followed by particles like 'だ' or 'な' when used as an adjective.