sizing someone up

• assessingEvaluating worth or significance
• evaluatingJudging quality or worth
• scrutinizingExamining something very closely
• judgingForming an opinion
• appraisingEstimating value or quality

measuring · eyeing · scanning · reading · gauging · observing · staring · glancing · first impression · instinct · gut feeling · suspicious · wary · calculating · cold · intimidating · rival · stranger