Synderlicness

According to the Old English Dictionary:

synderlicness

Add: peculiar excellence :-- Heó weóx betweoh hire óðer twá sweostor tó heáhnesse þæs háligdómes ǽgðer ge mid þám mægne þæs singalan gebedes ge mid gestæþþignesse and synderlicnysse þæs fæstenes inter duas alias sorores suas virtute continuae orationis, gravitate vitae, singularitate abstinentiae ad oilmen sanctitatis excreverat, Gr. D. 286, 11. synderlicness