Antonyms for the word "Prenotion" include surprise, spontaneity, unpredictability, and suddenness. Prenotion usually refers to a feeling or intuition about something before it happens, and therefore its antonyms are words that describe the absence of this feeling. Surprise, for example, is the opposite of prenotion because it implies that something unexpected has happened. Spontaneity and unpredictability refer to events that happen without prior planning or warning. Suddenness is an antonym for prenotion because it implies that something happens without any indication beforehand. These antonyms are useful for expressing the opposite of prenotion in speech or writing.