“Primarily” in Japanese
Short answer
Primarily in Japanese is “本来” (honrai). Full meaning: originally, primarily; essentially, intrinsically, naturally, by nature, in (and of) itself; proper, rightful, legal, normal.
Other ways to say “Primarily” in Japanese
主に
omoni mainly, primarily, mostly, largely, chiefly
おもに
omoni mainly, primarily, mostly, largely, chiefly
主として
shutoshite mainly, chiefly, primarily, for the most part
ほんらい
honrai originally, primarily; essentially, intrinsically, naturally, by nature, in (and of) itself; proper, rightful, legal, normal
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