General Brazilian
medroso; assustado; apavorado
Most common usage in contemporary Brazilian Portuguese
Rio de Janeiro
medroso; com medo
Colloquial preference for 'com medo' in spoken language
São Paulo
medroso; assustado
Standard usage, slightly more formal
Portugal
medroso; receoso; temeroso
European Portuguese may use 'receoso' or 'temeroso' in more formal contexts