neat and orderly in appearance or habits; well ordered and cared for
methodical; precise
The country is laid out in a haphazard, sloppy fashion, offensive to the tidy, organized mind — Alan Brien
informal large or substantial
a tidy sum
She got a tidy sum for her car
tidily adv
tidiness noun
[Middle English tidi timely, in good condition, from tide1 in the sense ‘time’]