potent
supereffective
good
trenchantly
effectatious
efficious
availing
efficient
like a charm
effectively
cooking with gas
potently
effectuously
quick-handed
strong
ride the crest of the wave
powerfully
strongly
intensive
high speed, low drag
equieffective
feckful
supersuccessful
performantly
roaringly
hit
romping good
megasuccessful
ringing
lively
well-oiled
stiff
superempowered
hard
go a long way
severe
knockout
handsomely
effectivate
formidably
effectivize
efficiently
strongfully
excellently
strident
vigorously
efficacious
smartly
cock on
articulate