This is the 13853rd most frequent Russian word.
обещанный
Promised.
The word 'обещанный' is used as an adjective formed from the past participle of 'обещать', meaning 'promised', describing the gift.
Обещанный подарок был доставлен вовремя.
The promised gift was delivered on time.
Here, 'обещанный' functions as an adjective modifying 'зарплатный надбавку', emphasizing that the bonus was previously promised.
Он наконец-то получил обещанный зарплатный надбавку.
He finally received the promised salary bonus.
In this sentence, 'обещанное' is used substantively as a neutral adjective referring to a mentioned promised thing, the 'budget increase'.