based on convention (and so sometimes appearing insincere)

common, normal

in common or general use now

contemporary; common

in agreement with, according to, custom

usual, established

happening, used, daily; common and familiar

common

well known to a person

common, well-known

of, affecting, all or nearly all; not special, local or particular; an army officer with the highest rank below Field Marshal

common, accepted

of give; already agreed; already known or decided

likely

regular, usual; having a habit mentioned

usual, established

of, concerning, produced by, nature, belonging to a person from birth, not because of surroundings or learning

normal, everyday

in agreement with what is usual, average or regular

common, usual

common, seen or done everywhere (at the time in question)

accepted, widespread

the fixed and usual way of doing things

habitual

usual, established

usual, established

not special or worth nothing

ordinary

happening often; ordinary, expected

common, typical

confirmed

confirmed

what a person is accustomed to doing

in the habit of