properest
prop-er-est
adjective
Most correct, suitable, or appropriate for a particular situation or purpose.
"That's the properest way to make a cuppa."
Thesaurus
Synonyms: victorian, fitting, proper, tight-laced, straitlaced, straight-laced, becoming, square-toed, correct, halal, strait-laced, prudish
Antonyms: improper