sackless
Blameless, guiltless, innocent.
archaic
The candles will burn bright.
[…] And where that sackless knight lies slain, […]
Where it comes from
From Middle English sakles, sacless (“innocent”), from Old English saclēas (“free from charge, innocent, safe”), from Proto-Germanic *sakalausaz (“free from accusation”), equivalent to sake + -less. Cognate with Danish sagesløs (“blameless”), Swedish saklös (“blamesless”), Icelandic saklaus (“innocent”), Faroese sakleysur (“unoffending, innocent”). More at sake, -less.
Adapted from the Wiktionary entry sackless (CC BY-SA 4.0).