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.
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.
sure / safe
'sicher' and 'hundertprozentig' can both express that there is no doubt. 'sicher' is the normal word when you are convinced of something or consider something very likely. 'hundertprozentig' is stronger and emphasizes: really completely, without even the slightest doubt. Learners may confuse the words because both often work like a confirmation. In everyday language, 'sicher' sounds more neutral. 'hundertprozentig' fits when you want to emphasize especially strongly that something is absolutely certain.
Vor dem Kauf wollte Maria hundertprozentig wissen, ob das Gerät funktioniert.
Before buying it, Maria wanted to know one hundred percent whether the device worked.
Ich bin sicher, dass der Termin heute um zehn Uhr beginnt.
I am sure that the appointment starts at ten o'clock today.