1 neat, orderly, trim, shipshape, spruce, spick and span, clean, well-kept, well-groomed:
Change your clothes and come back when you're tidy.
2 well-organized, organized, well-ordered, methodical, systematic, trim:
They refused to clean his office till he had made it tidy.
3 respectable, sizeable, significant, considerable, substantial, good, goodly, good-sized, ample, large, big, fair, generous, not insignificant; Colloq not to be sneezed at:
They settled a tidy sum on their daughter when she was married.
4 Often, tidy up. neaten (up), straighten (out or up), clean (up), put in order, Colloq fix (up), spruce up, organize, reorganize, arrange, rearrange:
You can't watch television until you've tidied up your room. Please tidy up the files by the end of the week.