1. treating someone as if they are a child or lack maturity; making someone seem childish or immature
Usage: present participle of infantilise (British spelling); also infantilizing (American spelling); often used in critical or negative contexts

1. tending to treat people as children; characterized by or involving condescension toward adults
Usage: descriptive use of the present participle

Examples

• The manager's infantilising tone when speaking to the team made everyone uncomfortable.
• She found the company's marketing campaign infantilising to women.
• Infantilising language in the instructions made the task seem harder than it actually was.
• He objected to the infantilising way his parents still treated him at age thirty.
• The policy was criticized for being infantilising toward elderly residents.
• Using simple words isn't infantilising if it genuinely helps people understand.