Charles Ellicott Commentary Job 20:12

"Though wickedness be sweet in his mouth, Though he hide it under his tongue," — Job 20:12 (ASV)

Though wickedness be sweet in his mouth. —He draws a picture of the wicked man after the pattern of a gourmand or glutton, which, if it were intended to apply to Job, was a fresh instance of heartless cruelty, as well as of an entire want of discernment of character, and of unfitness for the office of judge he was so ready to assume. It is possible that the reproach here aimed at Job was that of inordinate love of riches, which Zophar extracts from the bare fact of his having been a wealthy man.