undetestingadj.
Etymology: Previous versions of the OED give the stress as: undeˈtesting.
the mind > emotion > hatred > loathing or detestation > [adjective] > not
1736 J. Thomson 293 Who these indeed can undetesting see?—But who unpitying?
This entry has not yet been fully updated (first published 1921; most recently modified version published online June 2019).