疲れる
つかれる (tsukareru)
to get tired, to become exhausted
verb (ichidan)
Example
今日は一日中働いて、とても疲れました。
きょうはいちにちじゅうはたらいて、とてもつかれました。
Kyou wa ichinichijuu hataraite, totemo tsukaremashita.
I worked all day today and became very tired.
Commonly used to express physical or mental fatigue. Can be used with different levels of politeness.