Cliched
Stale, Hackneyed
noun, な adjective
If you keep exhibiting the same actions and emotions and phrases eventually they're going to rot and sound cliched to everyone. You have to mix things up once in a while. You don't want to get stale, do you?!
ちんぷ
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own. Just watch out for ふ becoming ぷ.
陳腐な台詞しか思い浮かびません。
I can’t think of anything but cliched lines.