一回忌[ikkaiki] first death anniversary
一周忌[isshuuki] first anniversary of death
回忌[kaiki] death anniversary
忌まわしい[imawashii] unpleasant
忌む[imu] to avoid

忌中[kichuu] mourning
忌日[kinichi] anniversary of a person's death (on which Buddhist commemorative rites, etc. are performed)
忌避[kihi] evasion
忌憚[kitan] reserve

忌憚[kitan] reserve
憚る[habakaru] to hesitate
憚り乍ら[habakarinagara] with all due respect ...
憚り様[habakarisama] thank you for your trouble

過ちては則ち改むるに憚ること勿れ[ayamachitehasunawachiaratamurunihabakarukotonakare] do not delay to make amends for one's wrongs
憎まれっ子世に憚る[nikumarekkoyonihabakaru] Ill weeds grow apace
憚り[habakari] hesitation
忌憚のない[kitannonai] unrestrained