na-adjective, noun
eventfulness; many things happening
Describes a situation or period full of events, incidents, or busyness. Often used in the phrase 多事多難 (たじたなん, 'eventful and full of difficulties').
今年は多事な一年だった。
This year was an eventful one.
多事多難の折、お見舞い申し上げます。
In these eventful and difficult times, I extend my sympathies.
Composed of 多 (many) and 事 (things, matters). The word is a straightforward kanji compound meaning 'many matters/events'.