synderlicness
This might be just a supplemental entry adding to an entry in the Main Volume.
In the OE text, the length is:indicated by acute accentsindicated by macronsnot indicated.
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.
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A Combined List of Abbreviations.

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A Combined List of Abbreviations.