Senior
Older Graduate, Superior
noun
My comrade who came before me is my senior, my senpai (せんぱい).
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well, but just remember that the second kanji is read as ぱい because of the rendaku on はい.
あの先輩と話をすると、いつも肩がこるんだよね。
I always feel tense when I talk to that senior.
先輩に何を言われても、気にせず無視すればいいんだからね。
Don't get bothered by it and just ignore whatever that older graduate says about you, okay?
俺の先輩、悪い人では無いんだけどさ、ただちょっと俺とは反りが合わないんだよね。
My superior isn’t a bad guy, but he and I just haven’t been able to hit it off.