Growing out of, or depending on, custom or tacit agreement; sanctioned by general concurrence or usage; formal.
Based upon tradition, whether religious and historical or of artistic rules.
Abstracted; removed from close representation of nature by the deliberate selection of what is to be represented and what is to be rejected; as, a conventional flower; a conventional shell. Cf. Conventionalize, v. t.
Either you repeat the same conventional doctrines everybody is saying, or else you say something true, and it will sound like it's from Neptune. Noam Chomsky
Conventional people are roused to fury by departure from convention, largely because they regard such departure as a criticism of themselves. Bertrand Russell
I have known a vast quantity of nonsense talked about bad men not looking you in the face. Don't trust that conventional idea. Dishonesty will stare honesty out of countenance any day in the week, if there is anything to be got by it. Charles Dickens
Sanity is only that which is within the frame of reference of conventional thought. Erich Fromm
Die? I should say not, dear fellow. No Barrymore would allow such a conventional thing to happen to him. John Barrymore