1. existing beyond what is obvious or admitted; hidden or concealed
Usage: often used with ‘motive’

Examples

• She suspected he had an ulterior motive for offering to help.
• The politician’s generous donation seemed to have ulterior purposes.
• I wonder if there’s an ulterior reason behind his sudden kindness.
• The company’s environmental campaign had ulterior commercial motives.
• His offer to drive her home appeared innocent, but she sensed ulterior intentions.
• The charity questioned whether the large donation came with ulterior strings attached.