also: さっきゅう
na-adjective, noun which may take the genitive case particle 'no', noun
Describes something that needs to be done or dealt with very soon, without delay. Often used in formal or business contexts to emphasize urgency.
早急な対応が必要です。
An immediate response is necessary.
This problem must be resolved urgently.
We look forward to your prompt reply.
Please respond promptly to the complaint.
There is a need to improve this immediately.
We kindly ask for your prompt response.
It was decided that immediate measures would be taken to solve the problem.
早急 is a stiff, business-register word for needing prompt action, whereas 大急ぎ is the everyday word for personal haste.
早急 describes something that must be done immediately (as a な-adjective), while 急遽 describes the act of doing something hurriedly.