Vad Ă€r rigid? Vad Ă€r rigid? Not flexible or pliant; stiff.Not moving; fixed.Marked by a lack of flexibility; rigorous and exacting: "We have watered down a rigid training . . . until we now have an educational diet in many of our public high schools that nourishes neither the classes nor the massesâ ( Agnes Meyer). Scrupulously maintained or performed: rigid discipline. See Synonyms at stiff.