か弱い[kayowai] frail
ひ弱い[hiyowai] weak
意志薄弱[ishihakujaku] weak-willed
胃弱[ijaku] dyspepsia
虚弱[kyojaku] feebleness

強弱[kyoujaku] strength
弱い[yowai] weak
弱い者[yowaimono] weak person
弱い相互作用[yowaisougosayou] weak interaction (physics)

意志[ishi] will
意志の強い[ishinotsuyoi] strong-minded
意志の疏通[ishinosotsuu] mutual understanding
意志決定機関[ishiketteikikan] decision-making body
意志薄弱[ishihakujaku] weak-willed

意志決定[ishikettei] decision-making
遺志[ishi] dying wish
厚志[koushi] kind intention
志す[kokorozasu] to plan