Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
mental [ˈmɛntl] adj (ability, exhaustion) у́мственный; (image) мы́сленный; (illness) душе́вный, психи́ческий# (arithmetic, calculation) в уме́
mental healthcare забо́та о душевнобольны́х
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.