For example, the word for "doctor" is, well, "doktor". But the word is masculine. There's a feminine derivation, "doctorsha" - "female doctor" -- but it sounds somewhat condenscending to me, like you doubt her competence. "Oh this doktorsha prescribed me wrong pills again".
So the neutral, respectful way to refer to a female doctor is to refer to her using the "neutral" masculine form "doktor". And it doesn't sound odd to me at all. But here's where the fun starts: adjectives need to agree in gender with their noun. And the correct grammar is "good (masc.) doctor (masc)". However, there's a recent trend to have it like "good (fem.) doctor (masc)". I.e. the grammar is completely bonkers but somehow it sounds acceptable to my ear.