This is the 2556th most frequent Japanese word.
嬉しく
"嬉しく" means "gladly" or "happily."
In this sentence, '嬉しく' (ureshiku) derives from '嬉しい' (ureshii), which means 'happy' or 'glad'. This form functions as an adverb describing the state or manner of the subject's feeling.
あなたが来てくれて、とても嬉しく思います。
I'm very happy that you could come.
Here, '嬉しく' is part of '嬉しくなった', using the adverbial form of '嬉しい' combined with 'なる' (to become), illustrating a change into the state of being happy.
試験に合格したと聞いて、嬉しくなった。
I became happy upon hearing that I passed the exam.
In this example, '嬉しくて' indicates the cause or reason behind the subsequent action, 'crying', which aligns with the connective usage of the adjective in the adverbial form.