"primitive idea" is correct and usable in written English.
You could use it to describe a notion that is outdated or unsophisticated. For example: "His view on the matter was quite a primitive idea."
"That model of motherhood, that primitive idea that 'nature' is God, nature is wisdom, it all comes from Rousseau," she said, a few days later.
Contemporary theologians of revelation are aware that historical and literary criticism have rendered untenable the primitive idea of revelation as the direct utterance of God to man.
The return to barter, by artists who can't get rid of their paintings for cash, is a sound and primitive idea.
He got in a few nasty zingers, but he has a primitive idea of humor: find a tender spot (Clooney's sex life, Hollywood Jews, gays, Rihanna) and poke a stick in it.
By Morris Ernst and E. B. White The New Yorker, April 2 , 1932P. 7 The return to barter, by artists who can't get rid of their paintings for cash, is a sound and primitive idea.
The New Yorker, April 2, 1932 P. 7 The return to barter, by artists who can't get rid of their paintings for cash, is a sound and primitive idea.
They had very primitive ideas.
Men have a complex relationship with it; indeed people on the whole have such primitive ideas about gender and sexuality.
In the 20th century, communists used primitive ideas about "scientific materialism" to try to re-engineer a New Soviet Man.
Starting in the late 19th century, eugenicists used primitive ideas about genetics to try to re-engineer the human race.
As biological science has progressed, these primitive ideas about body chemistry have been replaced by more complex ideas and by contemporary studies of hormones, neurotransmitters, and substances produced within the central nervous system, such as endorphins.
