Very; greatly; extremely — an adverb used to intensify adjectives or verbs.
今日は大変寒いので、コートを忘れないでください。
It's extremely cold today, so don't forget your coat.
先日は大変お世話になりました。本当に感謝しています。
Thank you very much for your help the other day. I'm truly grateful.
試験は大変難しかった。
The exam was terribly difficult.
Immense; enormous; great — describing something of very large size, degree, or importance.
大変な努力の結果、彼は賞を取った。
As a result of enormous effort, he won a prize.
その町は大変な発展を遂げた。
That town has undergone great development.
Serious; grave; dreadful — indicating a severe or alarming state/situation.
あの事故は大変な事態になっている。
That accident has become a serious situation.
病気が進んで、家族は大変な心配をした。
As the illness progressed, the family was greatly worried.
Difficult; hard; demanding — describing tasks or situations that require effort or are troublesome.
小さい子どもがいると、毎日が大変だ。
With small children, every day is tough.
この仕事は体力的にも精神的にも大変だ。
This job is tough both physically and mentally.
Archaic noun meaning a major incident or disaster (rarely used in modern Japanese).
古文には『大変』が災厄を指す例が見られる。
In classical texts, '大変' can be seen referring to calamities.