on-scuniendlic
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.
on-scuniendlic
AddSé þe onweg ácyrreð his eáre hé ne gehýre þá Godes ǽ, þæs bén byð onscuniendlic (-scunodlic, v. l., execrabilis), Gr. D. 210, 3.
This is a supplementary entry with editorial changes to an entry in the main volume of the dictionary. Look under the 'Possibly connected entries' below, or for the same headword in the list to the left.

A Combined List of Abbreviations.

Abbreviation not recognized. See:

A Combined List of Abbreviations.