Neat

1. Free from that which soils, defiles, or disorders; clean; cleanly; tidy.
2. Free from what is unbecoming, inappropriate, or tawdry; simple and becoming; pleasing with simplicity; tasteful; chaste; as, a neat style; a neat dress.
3. Free from admixture or adulteration; good of its kind; as, neat brandy; to drink one's vodka neat.
4. Excellent in character, skill, or performance, etc.; nice; finished; adroit; as, a neat design; a neat thief.
5. With all deductions or allowances made; net. [In this sense usually written net. See Net, a., 3.]
neat line (Civil Engin.),
a line to which work is to be built or formed.
Neat work ,
work built or formed to neat lines.