恐らく[osoraku] perhaps
恐れ[osore] fear
恐れ戦く[osoreononoku] to tremble with fear
恐れ入る[osoreiru] to be sorry
恐ろしい[osoroshii] terrible

恐喝[kyoukatsu] blackmail
恐慌[kyoukou] panic
恐妻家[kyousaika] hen-pecked husband
恐妻病[kyousaibyou] wife-phobia
恐縮[kyoushuku] feeling obliged

畏懼[iku] reverence
疑懼[giku] apprehension
恐懼[kyouku] being struck with awe
憂懼[yuuku] fear
懼れる[osoreru] to fear

危懼[kiku] fear
恐懼感激[kyoukukangeki] being struck with awe
驚懼[kyouku] being startled
惶懼[kouku] being struck with awe