majčinski

1. maternal; motherly
   Majčinska ljubav nema granica. — A mother's love knows no bounds.
   Probudio joj se majčinski instinkt. — Her maternal instinct kicked in.

2. like a mother; in a motherly way
   Učiteljica se majčinski brinula o svakom detetu. — The teacher looked after every child like a mother.
   Nasmešila mu se majčinski. — She gave him a motherly smile.

Majčin means belonging to a mother (majčina kuća), while majčinski means typical of a mother.