“For when they speak great swelling words of vanity, they allure through the lusts of the flesh, through much wantonness, those that were clean escaped from them who live in error.”
King James Version (KJV)
2:18 They ensnare in the desires of the flesh - Allowing them to gratify some unholy desire. Those who were before entirely escaped from the spirit, custom, and company of them that live in error - In sin.
2Pe 2:18 For when they speak great swelling [words] of vanity. This shows how they promise great things and disappoint. They offer "great swelling words", and entice those who are about to be delivered from error.