Meaning of “resentful” - Learner’s Dictionary

resentful

adjective uk us /rɪˈzentfəl/

angry and upset about a situation that you think is unfair:

He was bitterly resentful of his brother's success.
resentfully adverb
resentfulness noun [ U ]

(Definition of “resentful” from the Cambridge Learner’s Dictionary © Cambridge University Press)