Definition as Adjective

• (of especially persons) lacking sense or understanding or judgment
• (used as complement) to the utmost degree

• nitwitted, senseless, soft-witted

• shitless

• "he was scared witless"; "the students were bored shitless"

• Witless vs nitwitted
• Witless vs senseless
• Witless vs soft-witted
• Witless vs shitless