Thanks for your reply, and yes, I'm aware that this is the general case... but neither the Oxford grammar (which I have as well) nor my textbook (H&Q) are clear on the case for adjectives with two sets of endings in the positive...
Do the feminine forms [face=SPIonic]a)dikwte/ra
[/face] and [face=SPIonic]a)dikwta/th
Or are [face=SPIonic]a)dikw&teroj
[/face] and [face=SPIonic]a)dikw&tatoj
[/face] used in both masculine and feminine circumstances?
From the information I have, I really can't tell.