one hundred percent
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completely
Completely, entirely, 100 percent. Often used as an adverb in the sense of 'absolutely' or 'completely certain.'
Ich bin mir hundertprozentig sicher, dass ich die Tür abgeschlossen habe.
I am completely sure that I locked the door.
complete
Used as an adjective to express that something is total or complete.
Für diese Aufgabe ist hundertprozentiger Einsatz erforderlich.
Complete commitment is required for this task.
The word is made up of 'hundert' (hundred), 'Prozent' (percent), and the adjective ending '-ig.' It literally means 'consisting of one hundred percent.'
Diese Schokolade ist nicht hundertprozentig aus Kakao.
This chocolate is not one hundred percent cocoa.
'Hundertprozentig' (one hundred percent/complete) can stand as an adjective before a noun and is then declined. It can also be used as an adverb to intensify a verb or adjective, and then it remains unchanged.
Das war ein hundertprozentiger Erfolg für das Team.
That was a complete success for the team.
As an adverb in the sense of 'absolutely,' it is often combined with verbs of knowing or trust: 'hundertprozentig sicher sein' (to be completely sure), 'jemandem hundertprozentig vertrauen' (to trust someone completely), or 'hundertprozentig zustimmen' (to agree completely).
Du kannst mir hundertprozentig vertrauen, ich erzähle es niemandem.
You can trust me completely; I won't tell anyone.
As an adjective, it often describes abstract nouns that express completeness. Typical combinations are 'hundertprozentige Sicherheit' (complete certainty), 'hundertprozentiger Einsatz' (complete commitment), or 'eine hundertprozentige Garantie' (a one hundred percent guarantee).
Der Hersteller gibt eine hundertprozentige Garantie auf das Produkt.
The manufacturer gives a one hundred percent guarantee on the product.
completely
Both völlig and hundertprozentig can express a complete degree. Völlig is general, while hundertprozentig particularly emphasizes absolute certainty or complete fulfillment.
Nach seiner eindeutigen Bestätigung bin ich hundertprozentig sicher, dass der Termin morgen stattfindet.
After his clear confirmation, I am one hundred percent sure that the appointment will take place tomorrow.
Nach seiner Erklärung bin ich völlig sicher, dass der Termin morgen stattfindet.
After his explanation, I am completely sure that the appointment will take place tomorrow.
