noun
other intention; ulterior motive; secret purpose
Refers to a hidden or different intention behind someone's actions, often with a negative connotation. Also covers fickleness or double-mindedness in older or literary contexts.
彼の親切には他心があるかもしれない。
There may be an ulterior motive behind his kindness.
あの人の言葉には他心が感じられる。
I sense a hidden intention in that person's words.