His dashing leading man looks combined with a smarmy sense of humor works well for a character literally defined by having roguish charm.

Source: https://screenrant.com/dungeons-dragons-honor-among-thieves-cast-character-guide/

Waters plans to build a lavish shopping center in the small town, and it’s instantly clear from Long’s smarmy slick performance that his character is up to no good.

Source: https://www.themarysue.com/its-a-wonderful-knife-offers-little-beyond-a-clever-title/

When a smarmy, handsome lawyer named Duncan (Mark Ruffalo) pays a visit, he offers her freedom.

Source: https://decider.com/2023/12/28/poor-things-explained-emma-stone-movie-feminist/