iron-willed

determined firm resolute steadfast tenacious

courageous intense tough vehement

brave dedicated fervent fervid fierce gutsy hard-nosed plucky staunch unbending uncompromising unyielding zealous

doubtful loose mild slack soft unstable weak yielding

agreeable complacent feeble infirm irresolute laid-back moderate

headstrong

decisive mullish obstinate resolute strong-minded stubborn unbending uncompromising unyielding

spineless weak weak-willed