expeditiously

Mercurial is a related term of expeditiously.

As a noun mercurial

is (obsolete) any of the plants known as mercury.

As an adjective mercurial

is (often capitalized, see (mercurial)) pertaining to the planet mercury.

As an adverb expeditiously is

in an expeditious manner.

As adverbs the difference between posthaste and expeditiously

is that posthaste is quickly, as fast as someone travelling post; with great speed while expeditiously is in an expeditious manner.

As a noun posthaste

is an alternative spelling of lang=en.

Speedy is a related term of expeditiously.

As an adjective speedy

is rapid; swift.

As an adverb expeditiously is

in an expeditious manner.

As adverbs the difference between efficiently and expeditiously

is that efficiently is in an efficient manner while expeditiously is in an expeditious manner.

Snappily is a related term of expeditiously.

As adverbs the difference between snappily and expeditiously

is that snappily is in a snappy manner while expeditiously is in an expeditious manner.

As adverbs the difference between speedily and expeditiously

is that speedily is in a speedy or fast manner while expeditiously is in an expeditious manner.

Expeditiously is a related term of like_a_flash.

Rapid is a related term of expeditiously.

As an adjective rapid

is rapid; quick; fast; speedy.

As an adverb expeditiously is

in an expeditious manner.

As a noun celerity

is (in literary usage) speed.

As an adverb expeditiously is

in an expeditious manner.