"Rigid rules" refers to strict or inflexible guidelines or regulations that must be followed without any room for flexibility or exceptions. Full definition
Traditional child discipline and rigid rules of conduct are seen as restrictive of a child's natural development and free, independent thinking. (positive-parenting-ally.com)
You can decide whether to date someone going through a divorce on a case - by - case basis as there is no need to approach your dating life with rigid rules. (datingadvice.com)
It makes me uncomfortable to set rigid rules about where babies can sleep based on relatively low - risk behaviors. (amotherinisrael.com)