Greer was being interviewed as part of a cover story for Newsweek which claims Britain has “stopped believing in the Royal fairytale.”
The publication cites a survey published by YouGov as pointing at a decline in Kate’s appeal, with only 1% of female respondents wishing to be the Duchess and 89% saying they have no interest in being her even for a single day.
Greer had some praise for the pregnant 32-year-old, however stating: “Kate is a great deal more intelligent than the rest of the royals. She has been put in charge of William. She has a bastard of a job.”
But, the academic who claims to have dedicated her career to empowering women, added: “The girl is too thin. Meanwhile, she is vomiting her guts up and shouldn’t have been made to go through all this again so soon. It’s not so much that she has to be a womb, but she has to be a mother.
“I would hope after this one she says, ‘That’s it. No more.’"
The Duchess is suffering from severe morning sickness and was forced to drop out of her first solo Royal tour to Malta as a result.
The mother-of-one is expected to give birth to Prince George’s sibling in around six months time.
Greer continued to put the boot in, adding: “Kate is not even allowed to decorate her own houses. Even the wives of the American presidents get to do that.
“… Kate is not allowed to have an interest in modern culture, even in art – to collect, to attend openings. She is made to appear absolutely anodyne.
“She cannot do or say anything spontaneous. She has learned what she has to do and say and how to do it and say it in the approved way. Spontaneity will get her in trouble.”
Greer has form for commenting on the weight and appearance of other women.
In 2012 she referred to former Australian Prime Minister Julia Gillard’s appearance on live television by proclaiming: “I wish she’d get rid of those bloody jackets – they don’t fit. You’ve got a big arse Julia, just get on with it.”
In 2008 she wrote a piece for the Guardian in which she focussed on the outfits of Michelle Obama and her two daughters, remarking that the First Lady’s dress was “the most disturbing colours known to man, the colours of chaos.”
Meanwhile it’s not the first time Kate has found herself in the public firing line.
Last year Booker Prize winner Hilary Mantel described her as a “shop window mannequin” with a “plastic smile”, no personality and no purpose other than to produce an heir to the throne.