Lust is a desire that cannot be satisfied because it looks for fulfillment outside of God and His ways.
Proverbs 27:7 The full soul [the proud, puffed up] loatheth an honeycomb [wisdom of God]; but to the hungry soul [filled with lust, not whole or filled with the Word] every bitter thing is sweet [evil seems good to them - they dont even want to eat the honey - which would only satisfy them].
Haggai 1:6 ...ye eat, but ye have not enough; ye drink, but ye are not filled with drink; ye clothe you, but there is none warm; [insatiable because they are without God... only God can fill our needs as He gives wholeness and contentment]
Proverbs 30:15-16 The horseleach hath two daughters, crying, Give, give. There are three things that are never satisfied, yea, four things say not, It is enough: The grave [death and spiritually dead]; and the barren womb [unfruitfulness]; the earth that is not filled with water [earth=clay=man or rule of flesh without the living Water, "dry places" where demons dwell, spiritual desert vs the Promised land]; and the fire [torment of hell - unquencheable flames; also lust in which they burn] that saith not, It is enough [insatiable character of it because it does not abide in the fullness of God].