Irrationalities

Part of speech: noun

Definitions

The quality of being unreasonable or lacking sound judgment
behaviors or beliefs that defy logical reasoning or established norms
instances or manifestations of unpredictable or illogical thoughts and actions

Etymology: The noun in question traces its roots back to the adjective from which it is derived, formed by adding the suffix "-ity" to "irrational." The core adjective itself is composed of the prefix "ir-" meaning "not," and "rational," which comes from the Latin "rationalis," meaning "endowed with reason" or "reasonable." This Latin term derives from "ratio," meaning "reason" or "calculation." Thus, the word originally indicated a state or quality of lacking reason or logic. The suffix "-ity" is a common English formation borrowed from Latin "-itas," used to create abstract nouns expressing a state or condition. This formation entered English around the late Middle Ages and Early Modern period, allowing speakers to nominalize adjectives such as "rational" or "irrational" into concepts like "rationality" or its opposite, "irrationality." The plural form simply extends this notion to multiple instances or examples of such states. This word often appears in philosophical, mathematical, or psychological contexts, where distinctions between reason and unreasoned thought or behavior are crucial. The shift from a descriptive adjective to a noun encapsulating the concept of unreasonableness or illogical behavior reflects a broader linguistic pattern of abstracting qualities into standalone entities for discussion and analysis. While the term itself does not have a single memorable moment of coinage or a dramatic shift in meaning, its formation is a straightforward example of English’s capacity to build complex abstract nouns from Latin-based roots and affixes, passing through centuries of linguistic evolution to reach its current shape.

Synonyms: illogicalities, absurdities, unreasonableness, follies

Antonyms: rationalities, reason, logic, sanity, sense