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

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adj. Having or marked by imposing physical strength.

adj. Firm and resolute; stout.

n. One who is physically and morally strong.

n. One who steadfastly supports an organization or cause: party stalwarts.

adj. Firmly built.

adj. Courageous.

n. one who has a strong build

n. one who firmly supports a cause

adj. Brave; bold; strong; redoubted; daring; vehement; violent.

Stout; strong: applied to inanimate objects. [Scotch.]

Hard; severe.

Stormy; tempestuous.

Stout; sturdy; strong; bold; brave. See stalworth.

Sturdy and steadfast in partizanship: in United States politics [capitalized], noting various sections of the Republican party. See the phrase.

Synonyms Stout, Sturdy, etc. (see robust), sinewy, brawny, muscular, strapping, powerful, valorous, resolute.

n. A strong or sturdy person.

n. A stout and steadfast partizan; specifically [capitalized], same as Stalwart Republican. See above.

n. An ascetic, dogmatic, and strenuous person: noting a social type.

n. a person who is loyal to their allegiance (especially in times of revolt)

adj. having rugged physical strength; inured to fatigue or hardships

adj. dependable

adj. used especially of persons

"On Windows computers, your Lifehacker editors use Texter, while the Mac writers run TextExpander (your sole Linux stalwart is tinkering with AutoKey at the moment)."

robust    resolute    brave    courageous    stalworth   

gutless    spineless    cowardly    qualifier    informal   

champion    supporter    admirer    booster    protagonist    friend   

determined    stalwart republican   

brave    bold    strong    redoubted    daring    vehement    violent    stout    sturdy    valiant   

sturdy    burly    hardy    valiant    brawny    brave    broad-shouldered    staunch    bearded    fine-looking