† unmightlyadv.
Origin: Formed within English, by derivation. Etymons: un- prefix1, mightly adv.
Etymology: < un- prefix1 + mightly adv. Compare unmightily adv.
Obsolete.
rare.
(Harl. 221) 366 On-myghtly [?a1475 Winch. on-myhtyly], inpotenter.
This entry has been updated (OED Third Edition, December 2014; most recently modified version published online December 2020).