chiefly

/ˈtʃiːf.li/

TƩIːF · li (2 syllables)

English Adv Top 41,506

Definition

Especially or primarily; above all.

From Middle English chefly; equivalent to chief + -ly (adverbial suffix).

"Their relationship is chiefly professional."
"This is a term chiefly used by online gamers."
"But questions presisted^([sic]), chiefly because of the acknowledged and continuing Federal investigation of Mr. Mandel's wealthy friends, W. Dale Hess and Harry W. Rogers 3d, who have profited from business with the state."