noun which may take the genitive case particle 'no', na-adjective
very busy; hectic
Emphatic form of 忙しい, used as a な-adjective or with の to describe a state of being extremely busy.
今日は大忙しの一日だった。
Today was a very busy day.
年末はいつも大忙しだ。
The end of the year is always hectic.
Standard kanji spelling.
Search-only kanji form; not a standard spelling.
Standard adjective meaning 'busy'. 大忙し is a more emphatic, colloquial noun/adjectival noun form.
Compound of 大 (おお, 'big') + 忙し (いそがし, stem of 忙しい 'busy').