unmellowadj.
/(ˌ)ʌnˈmɛləʊ/, U.S. /ˌənˈmɛloʊ/ Not mellow (in various senses).
ΘΚΠ
the world > action or operation > undertaking > preparation > unpreparedness > [adjective] > unready or immature
green?a1300
rawa1398
indigest1398
unmatured?a1425
unripea1500
unseasonable1515
unbuilded1519
inchoate1534
unripened1561
uncivil1572
unmellowed1573
unmanured1577
unblown1587
ungrown1593
unpolished1594
rudimental1597
rude1600
unsalted1602
unseasoned1602
unlicked1612
embryon1613
unbakeda1616
unbloweda1616
unfledged1615
unmellow1615
sappya1627
embryous1628
unconcocteda1631
unkneaded1633
immature1635
sucking1648
vacuous1651
embryo1659
unelaborate1663
unmature1673
unformed1689
undeveloped1736
infantile1772
uncultivated1796
unelaborated1817
fetal1820
embryotic1823
embryonic1825
embryonary1833
sophomoric1837
seedling1843
rudimentary1851
unwrought1869
juvenescent1875
vealy1890
under-developed1892
1615 E. Hoby Curry-combe iv. 172 Did you euer heare such an vnmellow kind of arguing?
1787 Generous Attachment IV. 172 You..shall proclaim the unsavoury news; pert unmellow children shall bear it about.
1839 Monthly Rev. June 168 His style is vigorous..; but his power wants repose, his contrasts are often harsh and unmellow.
1863 ‘W. Lancaster’ Praeterita 44 Gray the mask Of twilight, and the bleak unmellow speed Of blindness on the visage of fresh hills.
1920 R. Carpenter Land beyond Mexico iii. 74 A school is reciting in unison at the top of unmellow childish voices some lesson of the day.
1976 Texas Monthly Jan. 133/3 Other tomato-based sauces tend to be unmellow.
2001 M. O'Keefe You think you Hear 241 That's not part of the plan, but it would be..unmellow of me to say so.
This entry has been updated (OED Third Edition, December 2014; most recently modified version published online March 2022).
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adj.1615