問う: ask, inquire; accuse (of a crime); care (about) / 訪う:

strengthens the prefixed adjective or adjectival noun

油断大敵: there's many a slip twixt cup and lip, carelessness is what will get you into trouble; security is the greatest enemy; Idleness is the devil's workshop

(Buddhist god) Dhṛtarāṣṭra