口无择言

to say not a word that is not appropriate (idiom) / wrongly used for 口不擇言|口不择言[kou3 bu4 ze2 yan2]

mouth / classifier for things with mouths (people, domestic animals, cannons, wells etc) / classifier for bites or mouthfuls

not to have / no / none / not / to lack / un- / -less

to select / to choose / to pick over / to pick out / to differentiate / to eliminate / also pr. [zhai2]

words / speech / to say / to talk