Completely (adverb)

In a complete manner

"Please completely fill in the box for your answer, using a number 2 pencil."

Completely (adverb)

To the fullest extent or degree; totally.

"He is completely mad."

Thoroughly (adverb)

In a thorough or complete manner.

"He went out in the rain and came back thoroughly drenched."

Completely (adverb)

In a complete manner; fully.

Thoroughly (adverb)

In a thorough manner; fully; entirely; completely.

Completely (adverb)

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

"he was wholly convinced"

"entirely satisfied with the meal"

"it was completely different from what we expected"

"was completely at fault"

"a totally new situation"

"the directions were all wrong"

"it was not altogether her fault"

"an altogether new approach"

"a whole new idea"

Completely (adverb)

so as to be complete; with everything necessary;

"he had filled out the form completely"

"the apartment was completely furnished"

Thoroughly (adverb)

in a complete and thorough manner (`good' is sometimes used informally for `thoroughly');

"he was soundly defeated"

"we beat him good"

Thoroughly (adverb)

in an exhaustive manner;

"we searched the files thoroughly"