Slow, sluggish; somnolent [1st quot.].

Is sleuthing a real word?

When you seek clues, you sleuth. You, sleuth, you! The word sleuth comes from the Old Norse sloth, meaning "trail" and sleuthing is following a trail. One type of bloodhound skilled at following trails is called a sleuthhound, and that word was shortened to sleuth in the late 19th Century, referring to an investigator.

Is the meaning of sleuthing?

intransitive verb. : to act as a detective : search for information. transitive verb. : to search for and discover.