unplumbableadj.
/(ˌ)ʌnˈplʌməbl/, U.S. /ˌənˈpləməb(ə)l/ Unfathomable; immeasurably deep.
ΘΚΠ
the mind > mental capacity > intelligibility > unintelligibility > [adjective]
uncouthc897
unnimlyc1225
incomprehensiblea1340
unsearchablec1384
unknowable?c1400
investigablea1425
uncomprehensiblea1425
unthinkablec1445
imperscrutablec1450
inscrutablec1450
inopinable?a1475
incomprenable1502
unspectable?1504
incogitablec1522
uncogitable1529
impenetrable1531
inimaginable1534
inexplicable1555
unsensible1555
unscrutable1562
unfashionable1563
unpenetrable1581
unexcogitable1592
ineffable1598
inexcogitable1599
indivinable1603
ininvestigable1604
incapable1605
searchless?1606
uncomprehensive1609
unconceivable1611
undivinable1611
unimaginable1611
unexplicable1615
unintelligible1616
unapprehensible?1617
unfathomable1617
imprehensible1622
ununderstandablea1631
indeprehensible1633
indiscernible1635
inscrute1639
inapprehensiblea1641
indiscoverable1640
unexaminable1641
impervestigable1643
fathomless1645
inconceivable1646
indeterminable1646
inexplorable1646
insearchable1647
incomprehended1652
comprehendlessa1654
incomprehensive1656
untraceable1661
uninvestigablea1677
unintelligent1683
incognoscible1691
thought-transcendinga1711
uncognizable1720
acataleptic1727
undescriptive1744
elusive1751
impalpable1781
inaccessible1796
unconjecturable1806
uncognoscible1821
unascertainable1827
unfixable1831
unguessable1832
unrealizable1832
unsurveyable1833
hard-shelled1835
unintellective1837
undeemed1845
graspless1849
unconjectured1850
incognizable1852
ungraspable1853
unreadable1853
super-cerebral1854
elusory1856
trans-conscious1865
intangible1880
uncatchable1892
unspelt1892
unplumbable1895
unknowledgeable1920
indiscutable1933
the mind > mental capacity > intelligibility > unintelligibility > depth, obscurity > [adjective]
higheOE
dighela1000
deepc1000
darkOE
starkOE
dusk?c1225
subtle1340
dimc1350
subtilea1393
covert1393
mystica1398
murka1400
cloudyc1400
hard?c1400
mistyc1400
unclearc1400
diffuse1430
abstractc1450
diffused?1456
exquisitec1460
obnubilous?a1475
obscure?a1475
covered1484
intricate?a1500
nice?a1500
perplexeda1500
difficilea1513
difficult1530
privy1532
smoky1533
secret1535
abstruse?1549
difficul1552
entangled1561
confounded1572
darksome1574
obnubilate1575
enigmatical1576
confuse1577
mysteriousa1586
Delphic1598
obfuscatea1600
enfumed1601
Delphicala1603
obstruse1604
abstracted1605
confused1611
questionable1611
inevident1614
recondite1619
cryptic1620
obfuscated1620
transcendent1624
Delphian1625
oraculous1625
enigmatic1628
recluse1629
abdite1635
undilucidated1635
clouded1641
benighted1647
oblite1650
researched1653
obnubilated1658
obscurative1664
tenebrose1677
hyperbyssal1691
condite1695
diffusive1709
profound1710
tenebricose1730
oracular1749
opaque1761
unenlightening1768
darkling1795
offuscating1798
unrecognizable1817
tough1820
abstrusive1848
obscurant1878
out-of-focus1891
unplumbable1895
inenubilable1903
non-transparent1939
1895 Financial Times 12 Dec. 6/5 Notwithstanding the apparently unplumbable depths of the gullibility of the British public.
1929 S. Leslie Anglo-Catholic x. 122 The pitiless unplumbable spaces filled him with terrors.
1980 D. Moraes Mrs Gandhi viii. 116 While she usually answers complex and difficult questions fluently, perfectly innocuous queries seem to drive her back into unplumbable depths of silence.
2013 Daily Tel. (Nexis) 11 Sept. His eyes, deep pools of unplumbable longing.
This entry has been updated (OED Third Edition, December 2014; most recently modified version published online December 2021).
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adj.1895