Unflattering (adjective)

1. Not making someone or something look attractive or appealing.
2. Not complimenting or giving a positive representation of someone or something.

Origin:

Late 19th century: from un- (expressing negation) + flattering.

Examples:

1. The unflattering picture made her look older than she actually was.
2. The unflattering reviews hurt the actor's ego.
3. The unflattering lighting made the room seem dingy.
4. The unflattering costume was a complete mismatch for the party.
5. The unflattering comments were not appreciated by the audience.