unbetterableadj.
Incapable of being improved.
ΘΚΠ
the mind > mental capacity > expectation > despair, hopelessness > desperate state or condition > [adjective] > incapable of improvement
incorrigible1541
unimprovablea1660
unbetterable1806
the mind > goodness and badness > quality of being good > perfection > [adjective] > that cannot be improved upon
unamendablea1525
incorrigible1611
unimprovable1822
unbetterable1874
1806 Ann. Rev. 4 82 The country is not only bad but unbetterable.
1874 J. Ruskin Fors Clavigera IV. xl. 76 A lovely, classic, unbetterable sentence of Marmontel's, perfect in wisdom and modesty.
This entry has not yet been fully updated (first published 1921; most recently modified version published online June 2019).
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adj.1806