Only a part of Hindi adjectives is declined. These are adjectives ending in -ā or -ā̃.
They change -ā to -e and -ā̃ to -ẽ in the oblique and vocative case :
अच्छा acchaa (good) > अच्चे acche, दायाँ daayaa (right) > दायेँ daayẽ
The same form in -e and -ẽ is also in plural.
In the feminine gender, in all cases and both numbers, -ā changes to -ii and -ā̃ to -ii~ :
अच्छा > अच्छी acchii, दायाँ > दायीँँ daayii~