idiom · to speak so correctly and appropriately that no word needs to be retracted or filtered out

真正有修养的人在任何场合都能做到口无择言，进退有据。

idiom · erroneously used in place of '口不择言 kǒu​bù​zé​yán' to mean speaking without thinking or indiscreetly

他由于情绪激动而口无择言，说出了许多伤害朋友的话。