1. in a way that praises or compliments someone excessively or insincerely
2. in a way that shows someone or something to advantage; favorably

Examples

• She spoke flatteringly about her colleague's work during the meeting.
• The portrait was painted flatteringly, smoothing out all his wrinkles.
• He described her flatteringly as the most talented person in the department.
• The lighting in that room is flatteringly warm and soft.
• She flatteringly compared his writing to that of famous authors.
• The photograph captured him flatteringly, making him look years younger.