v (transitive|+ partitive) To (have) doubt|doubt(s), question, wonder, be skeptical about, be doubtful.
v (transitive) To think, suspect, guess, imagine, conjecture, surmise, hypothesise/hypothesize, believe, suppose.
v (transitive|+ partitive) To suspect, mistrust, (be) distrust(distrustful|ful of), be suspicious of, harbour/harbor suspicions of, be apprehensive about, believe guilty.