wú yì
inadvertent
accidental
to have no intention of (doing sth)
wú yì zhōng
accidentally
unintentionally
unexpectedly
yǒu yì wú yì
intentionally or otherwise
wú yì jiān
inadvertently
unintentionally
yán zhě wú yì , tīng zhě yǒu xīn
to take a casual remark to heart (idiom)