The phrase "fixed ideas" is correct and usable in written English.
You could use this phrase when you're talking about strong beliefs that are difficult to change. For example, "My grandmother has some very fixed ideas about how a person should live their life."
If icons are fixed ideas about individuals, stereotypes are fixed ideas about groups.
But Coleman was not into concrete, fixed ideas.
Ideological Someone with fixed ideas whom we dislike.
It has fixed ideas on economics and government that are inflexible and irrelevant for modern times.
I know that all proper cooks have fixed ideas about their cooker of choice.
Populist politicians forgot that judges tend to have fixed ideas about the relative seriousness of offences.
OUTSIDERS often have fixed ideas of Poland: a big, poor country with shambolic governments, dreadful roads and eccentric habits.
Perhaps we feel that it's a waste of time to talk about something people have very fixed ideas about �� or dismiss as simply wishful thinking?
In the Edwardian period, the book says, fixed ideas of what childhood should be, and what constituted family values, made voluntary bodies unsure and unwilling to deal with the problems of children once they had been "rescued" from vice.
In this complex world of domestic and foreign affairs, we cannot afford leaders who have fixed ideas and beliefs — they cannot benefit from a wide range of ideas from the smart people around them and from the voters and their representatives.
For one camp, Fernando Fiore is a braying, ignorant buffoon hiding behind the figleaf of a credibility-conferring accent and mustache: remove the facial hair, these detractors say, wielding their at-replies and their hate, and Fiore will be revealed as nothing more than a jangly sack of filler quotes and fixed ideas.
