The phrase "a sluggishness" is correct and usable in written English.
It can be used to describe a state of being slow or lacking energy, often in reference to physical or mental performance.
Example: "After a long day at work, I felt a sluggishness that made it hard to concentrate on my evening tasks."
Alternatives: "a lethargy" or "a slowness".
Near the end of the summer, after developing a sluggishness she couldn't shake, she had her blood tested because she thought she might be anemic.
Those defeats — to Carolina in 2006 and to Philadelphia in 2009 — were demoralizing, and early on Sunday, there was a sluggishness to the Giants' play that felt foreboding.
While Sprewell and Larry Johnson did well to harass him, bump him on his cuts and deny him the ball, there was a sluggishness to Hill.
As for the others, there is a sluggishness and lack of movement to them that stands in odd counterpoint to the activeness of the walls.
So, six months before the 1996 Olympic swimming trials, Carvin became alarmed when a sluggishness set into his body and would not leave.
There was a sluggishness about Dundee for most of the second half, which made the home team appear conspicuously quicker mentally and physically.
Faced with a similar sluggishness last year, America's Federal Reserve promised to jolt the economy with a second round of quantitative easing: printing money to buy government bonds.
A certain sluggishness mars the middle chapters of this distinct fantasy novel, but Lowachee's ability to portray complex fictional cultures is impressive.
THE nation's pizza peddlers, stung by a recent sluggishness in sales, are stepping up their already frenetic advertising, marketing and promotional efforts.
Turnovers and missed layups and a general sluggishness gave way, midway through the second quarter, to hustle in going after rebounds, along with a series of short-range hook shots and crowd-energizing faceup jumpers.
The visitors had looked the more settled team in the first half here, tribute to their own energetic and diligent midfield and also to a general sluggishness in Chelsea's passing and movement.
