蒼茫[soubou] dusky
茫然[boozen] dumbfounded
茫然自失[bouzenjishitsu] stupor
茫漠[boubaku] boundless
往事渺茫[oujibyoubou] memories of the past events (being, becoming) far and distant

往事茫茫[oujiboubou] memories of the past events (being, becoming) far and distant
茫茫[boubou] wide expanse of flat surface (e.g. sea, plains)
草茫々[kusaboubou] covered with weeds
渺茫[byoubou] vast

一念発起[ichinenhokki] being resolved to (do something)
引き起す[hikiokosu] to cause
縁起[engi] omen
喚起[kanki] arousal
起きる[okiru] to get up

起上る[okiagaru] to rise
起す[okosu] to raise
起こり得る[okoriuru] to be possible to occur
起る[okoru] to occur
起つ[tatsu] to rise up