The word "岂有此理" is formed by sequentially combining the rhetorical adverb "岂" (meaning "how can"), the verb "有" (meaning "there is"), the demonstrative pronoun "此" (meaning "this" or "such"), and the noun "理" (meaning "principle" or "reason"), resulting in a literal rhetorical question translating to "how can there be such a principle?" which functions as an idiom to denote something as absurd or unreasonable.