Charles Ellicott Commentary Psalms 78:30-31

"They were not estranged from that which they desired, Their food was yet in their mouths, When the anger of God went up against them, And slew of the fattest of them, And smote down the young men of Israel." — Psalms 78:30-31 (ASV)

Evidently from Numbers 11:33, They did not yet loath in consequence of their lusts, the meat was yet in their mouths when, etc. For the expression, compare the Latin alienari ab aliqua re, to be disinclined to a thing, and our own “stranger to fear,” etc.