unsuspectablyadv.
Etymology: Previous versions of the OED give the stress as: unsuˈspectably.
society > morality > virtue > absence of moral flaw > [adverb] > in a manner above suspicion
1748 S. Richardson III. iv. 30 Grief so unsuspectably sincere.
This entry has not yet been fully updated (first published 1926; most recently modified version published online June 2019).