The phrase "acting ignorant" is correct and usable in written English.
It can be used to describe someone who is pretending not to know something or is deliberately avoiding knowledge about a topic.
Example: "He was acting ignorant during the discussion, even though he clearly understood the subject matter."
Alternatives: "feigning ignorance" or "pretending not to know".
It was a characteristically unclear answer, and Rupert Murdoch did not look like he was acting ignorant.
"If Jennifer listened to him and stopped acting ignorant, she'd be all right," Richard Williams told Inside Tennis magazine.
Under Obama, US financial aid to Israel has reached its highest levels ever, but since I was acting ignorant about Israel in order to not arouse suspicion, I didn't mention that to Shaul.
"You're acting stupid, ignorant!" she said.
To those in political power, however, Brecht would be deferential, throwing the beloved works of Lenin overboard lest the U.S. immigration authorities object, strictly obeying the curfew laws for enemy aliens and soothing HUAC, before which he appeared in 1947, with half-truths, when not bedeviling it by acting the ignorant foreigner.
Do not be stuck up, a show-off, rude, ignorant, acting all that, call norms (people who don't have HC) any mean names, treat others the way you want to be treated.
But Samantha put Mother on blast, insisting "You're acting just like those ignorant people think a witch acts... and you're doing it to the one person who was willing to believe we were different!" Doesn't Matter Who You Love.
That's made it hard to watch the governor propose drastic cuts to many education- and school-related programs, and even harder to listen to Bevin refer to teachers who opposed his agenda as "selfish" and "ignorant" people acting with a "thug mentality".
Wait a minute, isn't your job to be the deliberately ignorant side of this conversation, acting as a humorous counterpoint to my hand-wringing concern?
Nor is it true that self-interest generally is enlightened; more often individuals acting separately to promote their own ends are too ignorant or too weak to attain even these.
Ironically, those same voices chanting against America are chanting in favor of Egypt's American-made military, seemingly ignorant to the extent to which the two are acting in concert with each other.
