The phrase "a rigid principle" is correct and usable in written English.
You can use it to describe something, typically a belief or value, that is inflexible and unchanging. Example: Tom's approach to work is guided by a rigid principle of always putting efficiency above all else.
Retort away, says the pro-life leader: the argument will make pro-abortion groups sound extreme.In an era of scepticism and division, standing on rigid principle can be a blunder, it turns out: a tool for firing up partisans, useless for swaying voters in the middle.
At least some of Fontane's interesting bifurcations, political as well as temperamental, may be attributed to his mismatched parents: his father the Prinzipienverächter, the hater of rigid principle, his mother a Prinzipienreiter, a stickler for principles.
Robert was a man of rigid principles, a disciplinarian teetotaller who was treasurer of the local Methodist chapel.
Abu Hanifa extended the rigid principle of basing rulings on the Qur'an and Sunnah to incorporate opinion and exercise of free thought by jurists.
The story about the psalter seems to represent Francis as a man of rigid principles.
Mr. Wilder was a man of rigid principles and strong abilities that were ultimately frustrated — at various times, he was a newspaper editor, a columnist, a renowned public speaker, and the American consul-general in both Hong Kong and Shanghai.
A brilliant, successful lawyer with a reputation for integrity and rigid principles, he advocated women's rights, minority rights and human rights.
As a result, many architects and critics faulted him for violating the rigid principles of orthodox Modernism, for each time adopting a different "style for the job".
While British papers may operate with less rigid principles than American papers (Dow Jones, for example, has long prohibited journalists from owning shares in companies that they cover), they do carefully watch themselves in one area: libel.
Chanel is one of the most profitable and extravagant of the luxury houses, founded on the rigid principles of Coco Chanel, who pioneered its famous tweed jackets, quilted bags and profitable fragrances, including Chanel No 5. Its fashion shows had previously been seen as bold displays of power.
