Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
crusty [ˈkrʌstɪ] adj хрустя́щий#; (fig) раздражи́тельный*раздражи́телен (bread) ко́рочкой; (old gentleman) жёлчный
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.