This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

adj. Lacking firmness, resilience, or muscle tone. See Synonyms at limp.

adj. Lacking vigor or energy: flaccid management.

adj. Flabby.

adj. Soft; floppy.

adj. Lacking energy or vigor.

adj. Yielding to pressure for want of firmness and stiffness; soft and weak; limber; lax; drooping; flabby

Soft and limber; lax; drooping by its own weight; without firmness or elasticity; flabby: as, flaccid flesh.

adj. out of condition; not strong or robust; incapable of exertion or endurance

adj. drooping without elasticity; wanting in stiffness

"My guess is, the use of the word flaccid was no accident."

unfit    soft   

limber    lax    drooping    flabby    limp    baggy    soft   

nerveless    rubbery    limp    fleshy    flabby    unresponsive    lumpy    puffy    sinewy    colorless