Definition of "unlust"

Poetry for me wove its own spell to secure me against all 'unlusts' - all criticisms - even against joylessness: I was set apart; in safety; as secure - in this way - as he. Who was in that audience, I wonder now? That all was success is certain.

1983, Alison Waley, A Half of Two Lives

We fynde in oure silves vnlust and tediousnes to do good.

1526, William Tyndale, A compendious introduction, prologue, or preface into the epistle of Paul to the Romans

In all hys meates lette a litle saffron be put:..but it causeth vnluste in the stomacke.

1561, Hieronymus von Brunschwig, translated by John Hollybush, A most excellent and perfecte homish apothecarye

Yf you once fawl to lasynes or unlust..than is the scarby redy to catch you by the bones.

1582, diary of Richard Madox