Other telltale signs are too much eye contact and arm folding as a barrier ritual to defend themselves. Stillness is also often an option for a liar, who might adopt a neutral, deadpan expression and try to keep all movement to a minimum to avoid looking guilty. “This is why we partnered with Judi, to see what a real expert makes of this.”Top 15 common traits of a liar1. NON-VERBAL DEVIATION: To unmask a liar, watch them tell the truth first to use as a baseline, so you can spot changes and deviations2. FORCE-FIELD RITUALS: A liar will often try to defend themselves, which could emerge as barrier rituals like arm-folding, one shoulder-shrugs or head-shaking denial rituals.