1 noun fact of not being knowndeorantacht femdue to the unfamiliarity of the diseasede bharr a laghad eolais atá ar an ngalar, toisc nach bhfuiltear eolach ar an ngalar2 noun fact of not knowingaineolas masc1 c m ueaspa eolaiseaspa taithí c m uthere's a growing unfamiliarity with naturetáthar ag éirí níos aineolaí ar an dúlramy unfamiliarity with the program didn't helpníor chabhraigh m'easpa taithí féin ar an ríomhchlár