感激
gǎnjī
to be grateful, to appreciate deeply
verb
Example
我非常感激老师对我的帮助和指导。
Wǒ fēicháng gǎnjī lǎoshī duì wǒ de bāngzhù hé zhǐdǎo.
I am very grateful for my teacher's help and guidance.
感激 expresses deeper gratitude than 谢谢. It's often used when someone has done something significant for you or when expressing heartfelt appreciation.