completely /kəmˈpliːtli/adverb 2forms 2phrases 1 adverb2 •in every part, with nothing missingPlease completely fill in the box for your answer, using a number “2” pencil.I will have completely finished my degree by next July, when my thesis has been properly edited. •To the fullest extent or degree; totally.He is completely mad. formsmore completely · most completely Phrases with completely completely and utterlyTotally; entirely.