I would say a antonym of guise would probably be "reality", since GUISE is a word for fake.
galz
Guise Will Be Guise was created on 2000-11-07.
She put on a friendly guise to hide her true intentions.
Angel - 1999 Guise Will Be Guise 2-6 is rated/received certificates of: USA:TV-14
William Guise was born in 1653.
William Guise died in 1683.
Dianne Guise was born in 1947.
John Guise was born in 1914.
John Guise died in 1991.
Tom Guise died in 1930.
Guise Baronets was created in 1661.
She presented herself in the guise of a successful businesswoman, hiding the fact that she was struggling financially.