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noun
stamina, mental or physical
Synonyms: backbone, body, brawn, brawniness, brute force, clout, courage, durability, energy, firmness, force, fortitude, hardiness, health, healthiness, lustiness, might, muscle, nerve, physique, pith, potency, pow, power, powerhouse, robustness, security, sinew, sock, soundness, stability, stableness, stalwartness, steadiness, steamroller, stoutness, strong arm, sturdiness, substance, tenacity, toughness, verdure, vigor, vim, vitality, zip
Antonyms: lack, weakness
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noun
intensity
Synonyms: clout, cogency, concentration, depth, effectiveness, efficacy, energy, extremity, fervor, force, juice, kick, potency, power, resolution, spirit, vehemence, vigor, virtue
Antonyms: enervation, lethargy, weakness
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noun
advantage, substance
Synonyms: anchor, asset, body, burden, connection, core, gist, guts, in, intestinal fortitude, license, mainstay, meat, pith, purport, security, sense, strong point, succor, upper hand, weight, wire
Antonyms: disadvantage, weakness