noun
state ceremony; grand ceremony
Formal, historical term for an important national or court ceremony. Rare in modern everyday use.
即位の礼は国の大儀として執り行われた。
The enthronement ceremony was conducted as a state ceremony.
na-adjective
troublesome; laborious; a pain
Describes a task or situation that feels burdensome, tedious, or too much effort. Often used in casual complaint. Can be used as a な-adjective.
毎日の掃除が大儀で仕方ない。
Daily cleaning is such a pain, I can't stand it.
大儀な仕事は後回しにしてしまう。
I end up putting off troublesome tasks.
面倒 also means troublesome, but is more neutral and widely used. 大儀 carries a stronger nuance of physical or mental weariness, often implying 'I can't be bothered'.
億劫 is very close in meaning, expressing reluctance due to bother. 大儀 is slightly more old-fashioned and may sound more dramatic or dialectal.
Originally referred to an important national ceremony (大儀). The 'troublesome' sense likely developed from the idea of something being a grand, burdensome affair.