effectual
If he had intended to stop the conversation, he could not have done it more effectually.
This, we trust, will effectually silence the sensational rumours which still persist.
Resolving this very severe financial crisis effectually means a temporary nationalization of part of the financial system.

SMART Vocabulary: related words and phrases

Efficient and effective
be firing on all cylindersidiom
businesslike
clockwork
come together
cut through something
developed
dispatch
ergonomic
ergonomically
ergonomics
high-functioning
hyper-efficient
seamless
seamlessly
smoothly
snappily
snappy
work wonders/miraclesidiom
workable
worth your saltidiom