It's awfully hot today, isn't it?
大変お世話になりました。
Thank you very much for your help.
serious; grave; immense; terrible
Describes a situation, problem, or degree that is extreme, severe, or of great magnitude. Often used in warnings or expressions of concern.
それは大変な問題だ。
That's a serious problem.
大変なことになった。
Things have gotten really bad.
Used when something requires great effort or is physically/mentally demanding; often in the pattern ～は大変だ.
毎日料理をするのは大変だ。
Cooking every day is hard work.
子育ては大変だけど楽しい。
Raising children is tough but enjoyable.
Archaic noun meaning a calamity or great event; rarely used in modern Japanese outside historical or literary contexts.
古文書には「大変」を災いの意で用いた例がある。
In old documents, 大変 is sometimes used to mean a disaster.
This book is very interesting.
I heard there was a terrible accident at the station.
Taking care of small children is hard work.
Your help was a huge relief to me.
大変 works fine in casual conversation, whereas 甚だ is literary and rarely heard in everyday chat.
大変 is a broad, everyday word for something difficult or a lot of work, while 苦しい is heavier and implies real pain, pressure, or hardship.
大変 is a common intensifier usable with both adjectives and verbs in polite speech, while 大いに leans toward emphasizing the degree of an action.
大変 objectively describes a difficult or serious situation, while 辛い expresses the subjective feeling of hardship.
大変 is a very common, everyday intensifier, while すこぶる is rarer and belongs to more written or formal registers.
大変 is a polite, widely used intensifier for 'very', whereas 随分 leans toward expressing the speaker's surprise at an unexpected degree.
大変 is a softer, widely-used intensifier suitable for casual and polite speech, whereas 極めて is more formal and used mainly in writing or formal speech.
大変 is a more formal intensifier suitable for polite or written contexts, whereas 凄い/すごく is casual and used mainly in spoken Japanese.
大変 is the common word for something being tough or serious, while 偉い in casual speech carries the same 'tiring/terrible' sense but sounds more colloquial or dialectal.