Use completely to describe something that is totally and utterly...something. A completely ridiculous idea is absolutely crazy and stupid.

Completely is an adverb that comes from the Latin completus, "to fill up." We use it to mean "entirely" or "wholly." So if a building is completely destroyed, no part of it is left standing. Reading a newspaper story or watching a documentary film completely means you finished it from beginning to end. And doing so can completely change your view on an issue.

Definitions of completely

adv so as to be complete; with everything necessary

“he had filled out the form completely
“the apartment was completely furnished”

adv to a complete degree or to the full or entire extent (`whole' is often used informally for `wholly')

“it was completely different from what we expected”
“was completely at fault”
all, altogether, entirely, totally, whole, wholly
part, partially, partly
in part; in some degree; not wholly

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