This is the 6725th most frequent Portuguese word.
garantido
Guaranteed.
Here, 'garantido' is used as a past participle functioning as an adjective to describe the state of being ensured or certain.
O sucesso do evento está garantido.
The success of the event is guaranteed.
In this sentence, 'garantiu' is the verb in past form, used to indicate the action of giving assurance or a promise.
Ele me garantiu que chegará a tempo.
He assured me that he will arrive on time.
This instance uses 'garantido' as an adjective to express the idea of security or assurance about an upcoming event or state.