The word sirenic has a positive connotation and refers to something that is soothing, calming, and entrancing. Antonyms for the word sirenic, include words such as cacophonous, strident, jarring, discordant, and harsh. These words have a negative connotation and are used to describe unpleasant sounds or situations that are disturbing, irritating, or noisy. Instead of being calming and restful, they're often annoying and overwhelming. Therefore, if you're looking for an opposite of sirenic, you can think of various antonyms that can help you describe something that causes jarring, unpleasant and irritating feelings.