with a flutter / just lapping the surface / with a flicker

疾う: quickly, swiftly

so, like that, in such a way, such

(dialect) so; such

(followed by a negative) even if, never / (followed by a negative) no matter what

(Kansai) thus

by far / continuing for a long time; long-lasting; forever; always; for the entire time

enough, amply / easily, skillfully

strictly, sternly

immediately