taru-adjective, adverb taking the 'to' particle
vast; wide; spacious; extensive
Rare literary term used in classical or highly formal writing to describe something vast and boundless, such as the sea, sky, or a grand vision. Often appears in the adverbial form 浩蕩として.
Before the vast expanse of the ocean, I was lost for words.
His vision is so vast and boundless that it's hard to grasp.
Rare literary kanji form; the word itself is uncommon.
The kanji 浩 means 'wide expanse of water' or 'vast', and 蕩 means 'melt' or 'vast'. The compound is of Chinese origin (kango) and is used in classical literature to describe boundlessness.