unfriendlilyadv.
Etymology: Previous versions of the OED give the stress as: unˈfriendlily.
the mind > emotion > hatred > hostility > [adverb]
1864 W. J. Linton ii. ii Your harsh words Unfriendlily apparel'd.
This entry has not yet been fully updated (first published 1924; most recently modified version published online December 2020).