mentionlessadj.
/ˈmɛnʃnləs/, U.S. /ˈmɛn(t)ʃənləs/ rare.
Not calling for, or worthy of, mention; that cannot be mentioned.
ΘΚΠ
the mind > attention and judgement > importance > unimportance > [adjective] > not worthy of notice or consideration
lessOE
smallc1405
unnotablec1454
regardless1557
mentionless1611
unregardable1614
unremarkable1625
inconsiderable1637
of no mentiona1640
unconsiderable1643
unobservable1658
unnoticeable1760
inconsequent1768
unappreciable1801
mousy1812
unnoteworthy1846
nebbishy1973
1611 J. Speed Hist. Great Brit. vii. vii. 297/1 Famous in his issue, though mentionlesse for action in himselfe.
1890 ‘M. Field’ Tragic Mary 206 I have been made the dupe Of mentionless deceit.
This entry has been updated (OED Third Edition, September 2001; most recently modified version published online March 2022).
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adj.1611