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

緩衝[kanshou] buffered
緩衝器[kanshouki] shock absorber
緩衝地帯[kanshouchitai] buffer zone
刺衝[shishou] stabbing
衝撃[shougeki] shock

衝撃波[shougekiha] shock wave
衝動[shoudou] impulse
衝動行為[shoudoukoui] shock action
衝動買い[shoudougai] impulsive buying
衝突[shoutotsu] collision