has ones doubts (verb) misdoubt: doubt
Sinonime: analyze,
assay,
diagnose,
examine,
explore, fool with, futz around, mess around, play around with, practice with,
probe,
prove, put to the test,
research,
sample,
scrutinize,
search, shake down,
speculate,
study,
try, try on, try on for size, try out,
venture,
verify, weigh