The phrase "foul idea" is grammatically correct and can be used in written English.
It indicates that an idea is unpleasant or morally wrong. Example: His foul idea to cheat on the exam was immediately shut down by his peers.
She compared Barack Obama to her father in a warm endorsement, and headed his vice-presidential search team, so she'd be on good terms with the White House.But many people are crying foul at the idea that Mrs Kennedy should be seriously considered for the appointment.
Mainstream economists would say these ideas fall foul of the "lump of labour" fallacy: the idea that there's a fixed amount of work in an economy, which we can just share out between us.
He knows that "some multinationals" will cry foul, arguing that the idea threatens their competitiveness with the rest of the world.
It shouldn't be a bastion of regressive social ideas and foul tempers.
Foul language, childish jokes, ideas.
"I had no idea it was foul," he conceded.
"Conrad Balatoni has went for a header, won it and they've given a foul - I've no idea why," said Archibald.
Alexis Petridis of The Guardian, said, "If you're going to do a five-minute song about cunnilingus, it's a good idea to enlist foul-mouthed rapper Nicki Minaj, whose bug-eyed contribution lends the proceedings an air of gripping abandon".
A set of guidelines was proposed on how journalists could report without running foul of the law and then the idea was retracted.
The eventual widespread use of burning sulfur yielding sulfur dioxide (with its "sharp, irritating odor") may have been based on an ancient idea that the more foul a medicine, the more effective it might be.
