KEY: Strength.
SYN: Force, vigor, power, security, validity, vehemence, intensity, hardness, soundness, nerve, fibre, sinew.
ANT: Weakness, imbecility, feebleness, insolidity, insecurity, invalidity, frailty, delicacy, softness, flimsiness, hollowness.
=
KEY: Strengthen.
SYN: Confirm, establish, fix, corroborate, secure, invigorate, fortify, {[incri-Hso]?}.
ANT: Weaken, disestablish, shake, loosen, sap, undermine, debilitate, diminish.
=
KEY: Strenuous.
SYN: Strong, resilute, determined, earnest, vigorous, ardent, bold, energetic, vehement.