Pastoral Epistle aerogram aimlessness air letter airgraph billet-doux bull chain letter dimissorial dimissory letter drop letter emptiness empty sound encyclical fan letter form letter futility inanity insignificance letter of credit letter of introduction letters credential letters of marque letters of request letters overt letters patent letters rogatory love letter meaninglessness mere noise monitory newsletter nixie noise nonsensicality nullity open letter pastoral letter phatic communion poison-pen letter purposelessness round robin senselessness unmeaningness unsignificancy