based on convention (and so sometimes appearing insincere)

common, normal

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

regular, usual; having a habit mentioned

usual, established

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

accepted, widespread

the fixed and usual way of doing things

habitual

not special or worth nothing

ordinary

happening often; ordinary, expected

common, typical