沛はい然ぜんはいぜんMeanings1taru-adjective, adverb taking the 'to' particletorrential (rain)Literary or formal description of heavy, pouring rain. Often used in the adverbial form 沛然として or 沛然と.沛はい然ぜんたる雨あめが一ひと晩ばん中じゅう降ふり続つづいた。Torrential rain continued to fall all night.
