treacherouslyadv.
In a treacherous manner; by or with treachery.
ΘΚΠ
the mind > goodness and badness > wrongdoing > treachery or treason > [adverb]
foulOE
hinderfullichec1200
falsely?c1225
traitorouslyc1330
treacherouslya1340
traitorly?a1349
treacherlyc1394
traitouslyc1450
treasonouslyc1450
treasonablyc1480
traditorously1536
the mind > mental capacity > knowledge > conformity with what is known, truth > deceit, deception, trickery > [adverb]
fakenlyOE
swikellya1023
ficklya1300
treacherouslya1340
guilinglya1382
sophisticallya1382
deceivably1387
guilefully1388
treacherlyc1394
deceivingly14..
guilouslyc1425
deceiteously1481
deceitfully1488
swikefullya1500
patchingly1570
faithlessly1581
abusively1595
dodgingly1599
fallaciously1612
deludingly1641
jugglingly1647
trickfullyc1790
hocus-pocusly1791
deceptiously1797
hocus-pocus1815
trickishly1824
deceptively1825
trickingly1833
dodgily1868
trickily1895
snakishly1935
society > morality > duty or obligation > recognition of duty > undutifulness > treachery > [adverb]
swikellya1023
swikinglyc1175
hinderfullichec1200
traitorouslyc1330
treacherouslya1340
traitorly?a1349
treacherlyc1394
traitouslyc1450
proditoriouslyc1460
traditoriouslyc1487
swikefullya1500
Judasly1508
traditorously1536
Judas-like?1569
perfidiously1589
traitor-like1594
the mind > mental capacity > belief > uncertainty, doubt, hesitation > unreliability > [adverb]
sliddera1400
slipperlyc1412
untrustlyc1440
precariously1646
ambiguously1706
uncertain1785
unreliably1857
treacherously1860
unsafely1870
the world > action or operation > harm or detriment > danger > [adverb] > insecurely or unsafely > treacherously or insecurely
treacherously1860
a1340 R. Rolle Psalter xiii. 5 With þaire tongis tricherously þai wroght.
1596 E. Spenser Second Pt. Faerie Queene v. vi. sig. R4 A Spaniell wayting carefully Least any should betray his Lady treacherously . View more context for this quotation
1678 N. Wanley Wonders Little World v. ii. §6. 469/1 Gratian..was treacherously murdered.
1860 J. Tyndall Glaciers of Alps i. xi. 69 I stepped..upon a block of granite..; it treacherously turned under me.
This entry has not yet been fully updated (first published 1914; most recently modified version published online June 2019).
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adv.a1340