迅速
Common
I-adj
Noun
1
adjectival nouns or quasi-adjectives (keiyodoshi)noun (common) (futsuumeishi)
(very) quick;rapid;swift;speedy;prompt;expeditious
間髪を入れず、迅速かつ的確な応対、畏れ入ります。
Such an accurate, lightning-quick reply. What can I say?