suitable; appropriate
strictly accurate; correct
strictly decorous; genteel
(often used after a noun) being strictly so-called
not part of the city proper
(+ to) belonging characteristically to a species or individual; peculiar to something or somebody
ailments proper to tropical climates — George Santayana
chiefly Brit, informal thorough; complete
a proper idiot
(often used after a noun) said of a representation of something in heraldry: appearing in its natural colour
appointed for the liturgy (form of church service) of a particular day
archaic belonging to oneself; own
archaic very good
properness noun
[Middle English propre proper, own, via Old French from Latin proprius one's own, special]