The phrase "casual of" is not correct or usable in written English.
It doesn't have a clear meaning, so it can't be used in any contexts.
SHOUTS & MURMURS casual of medical instructions for someone who has found the author unconscious and helpless.
Ominous though the play's premise is, laughs are elicited effortlessly from the most casual of dialogue.
SHOUTS & MURMURS casual of increasingly desperate letters to an ex-girlfriend.
A Dept. of Amplification on Weare Holbrook's casual of Oct. 1, entitled "Ampers'n'".
"He was just a ball of energy in the most casual of circumstances".
These days, even the most casual of backyard stargazers have found their hobby touched by computers.
SHOUTS & MURMURS casual of testimony before a Senate committee for the post of Under-Secretary of International Hospitality.
As even the most casual of comic-book fan knows, Batman is merely a man – just a very determined one.
The New Yorker, February 16 , 1998P. 88 SHOUTS & MURMURS casual of increasingly desperate letters to an ex-girlfriend.
SHOUTS & MURMURS casual of testimonials for the Gifts of State Warehouse Discount Club... What have Clem D. and Mrs. T. got that you haven't?
But even the most casual of viewers will instantly read the "expressive body language" of the exhausted fighters, the frantic corner men and the engaged spectators.
