primely
/ˈprʌɪmli/(also primily)
adverb
1In the first place, in the highest degree; firstly, primarily, originally.
2 Informal. Exceedingly well; excellently; extremely.
Origin
Early 17th century; earliest use found in Edmund Bolton (?1575/5–?1634), antiquary and historian. From prime + -ly. Compare Anglo-Norman primement first, originally, Spanish primamente firstly, originally, exceedingly well, excellently.