1.
If you describe things such as clothes as ~, you mean that they look unattractive. (OLD-FASHIONED)
? becoming
ADJ
2.
If you describe a person’s behaviour or remarks as ~, you mean that they are shocking and unsuitable for that person. (FORMAL)
His conduct was totally ~ to an officer in the British armed services...
Those involved had performed acts ~ of university students.
ADJ: oft ADJ to/of n