intrinsic (adj)

Or most commonly, intrinsically (adv) meaning “belonging to the very nature of a thing.”

1480-90; < Medieval Latin intrinsecus inward (adj.), Latin (adv.), equivalent to intrin- (int(e)r-, as in interior + -im adv. suffix) + secus beside, derivative of sequī to follow

A word that is tremendously overused, often redundantly, i.e., “intrinsic nature.” Suffers from the problem of employing the word “nature” in its definition, whatever that word means.  Etymologically, we see an interesting logic: intrinsic means “inside” and “beside,” the extrapolation here being that something that is both inside a thing and beside a thing is fundamentally a part of its “nature.”

Very closely related to “fundamentally.”