Read Romans 16:18 Using Other Translations
For they that are such serve not our Lord Jesus Christ, but their own belly; and by good words and fair speeches deceive the hearts of the simple.
For such persons do not serve our Lord Christ, but their own appetites, and by smooth talk and flattery they deceive the hearts of the naive.
Such people are not serving Christ our Lord; they are serving their own personal interests. By smooth talk and glowing words they deceive innocent people.