"Their words really unnerved me and took away my energy to study."
"Their words robbed me of motivation to study."
"Their words" 「彼らの言葉」
"robbed me of ~" 「私から〜を奪った」
"motivation to ~" 「〜の気力」
"study" 「勉強」
"Their words really unnerved me and took away my energy to study."
"to unnerve"「苛立たせる」
"took away my ~" 「私の〜奪った」
"my energy to study" 「勉強の気力」
[気力](https://eikaiwa.dmm.com/uknow/questions/74531/)についてもっと詳しく知りたい方はクリックしてください。
Their words unnerved me and now I don't feel like studying.
What they said took away my drive to study.
この場合、次のような言い方ができますよ。
unnerve「人の気力を奪う」を使った場合:
ーTheir words unnerved me and now I don't feel like studying.
「彼らの言葉は私の気力を奪い、私は勉強する気が失せた」
ーWhat they said took away my drive to study.
「彼らが言ったことは私の勉強する気力を奪った」
to take away one's drive to ... で「…する気力を奪う」とも言えますよ。
ご参考まで!