Observantine
/əbˈzəːv(ə)ntʌɪn/ /əbˈzəːv(ə)ntɪn/Roman Catholic Church. Now historical
noun
= observant.
adjective
= observant.
Origin
Early 17th century; earliest use found in Thomas Coryate (?1577–1617), traveller and writer. From Middle French, French Observantin from observant + -in.