adverb
Describes being fully exposed to or affected by something, often with a sense of direct impact or without mitigation.
彼はもろに批判を受けた。
He was directly criticized.
台風の影響をもろに受けた。
We were hit directly by the typhoon.
まともに also means 'directly' or 'head-on', but can imply 'properly' or 'seriously', while もろに emphasizes full, unmitigated impact.
すっかり means 'completely' in the sense of 'entirely' or 'thoroughly', often for changes of state, whereas もろに focuses on direct, often physical or emotional impact.
Derived from 諸 (もろ, 'both' or 'all'), with the adverbial particle に. The exact historical development is uncertain, but it has long been used to express direct, complete exposure.