The phrase "a bit evasive" is correct and usable in written English.
It can be used to describe someone who is not being straightforward or is avoiding giving a clear answer.
Example: "When asked about his plans for the future, he was a bit evasive, leaving everyone uncertain about his intentions."
Alternatives: "somewhat vague" or "a little unclear".
Well, I love him, don't I?" She sounded a bit evasive.
At best, you are going to look a bit evasive and unhelpful.
I disliked it my first time through; I found it a bit evasive, more artiness than art.
Backe was canny, if a bit evasive, after the 2-0 win against Portland, the Red Bulls' first win at home since July 6.
He manages to be affable and also a bit evasive, but in a way that makes you think he is just trying to keep things interesting.
As illustrated by the following quotation, the answers were frequently a bit evasive or shifted to a more practical direction: "No, I don't need it.
But not so fast -- Fellowes was a bit more evasive about the prospect of a "Downton" movie during a recent phone interview with the Los Angeles Times.
Today, "Act One" seems overlong, a bit lofty, and evasive about details, but its fledgling epiphanies continue to echo: A week after I had written "The Curtain Slowly Falls," I went into the bathroom, locked the door, and settling myself with a pillow behind me in the empty bathtub, I opened the closely written pages.
My mother had ten children (well, my father helped a bit)." He's mischievously, maddeningly evasive.
A Premiership spokesman was suitably evasive, saying it was "a bit early for a formal response", but he did add, opportunistically: "It does show the appeal of our rugby".
Anyway, Kelly-or-Norah was questioning probably-Tucker about Joe the Plumber, and it was plain from the questions -- and the evasive answers -- that Joe had lost a bit of his glow.
