An ulterior motive or hidden intention different from the apparent purpose; often implies ill will. Commonly used in phrases like 'I have no ulterior motive.'
その依頼に他意はありません、純粋に助けを求めているだけです。
There is no ulterior motive in that request; they're simply asking for help.
彼の親切には他意があるのではないかと疑ってしまった。
I began to suspect that his kindness might have an ulterior motive.
交渉相手の提案に他意がないか、注意深く確認した。
I carefully checked whether the negotiating partner's proposal had any hidden agenda.