From Longman Dictionary of Contemporary Englishhit-and-missˌhit-and-ˈmiss (also hit-or-miss) adjective DISORGANIZEDdone in a way that is not planned or organized → random The campaign was rather a hit-and-miss affair.
Examples from the Corpus
hit-and-miss• The legal procedure is far too clumsy and hit-and-miss.• a hit-and-miss advertising campaign• The resolution of the many conflicts between farmers and environmentalists remains a hit-and-miss affair.• Quite often though, through various hit-and-miss applications, he would get one of the engines running.• Their copulations can not be the somewhat hit-and-miss gropings practised by the millipedes.• We approach it in a hit-and-miss sort of way instead of through a systematic communication programme. 