Deeply means to a great extent or very strongly, especially with feelings, thoughts, or levels.
It comes from “deep” plus the adverb-forming suffix “-ly.” “Deep” itself comes from Old English “dēop,” meaning “profound, extending far down.”
We use physical depth to talk about emotional and intellectual depth—“deeply sorry,” “deeply moved,” “deeply confused.” That metaphor is so automatic we forget it’s a metaphor at all.
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