well-ordered,
in order, straight, arranged, immaculate, spotless, shipshape, spick-and-span,
tidy, orderly, trim
antonym: untidy
well-organized,
organized, methodical, systematic, careful, painstaking, tidy, orderly,
efficient, precise, regular
antonym: disorganized
straight,
undiluted, unmixed, full-strength, pure, plain, unadulterated
antonym: diluted
simple,
ingenious, convenient, effective, elegant, handy, useful, clever,
well-thought-out, nifty (informal)
graceful,
effortless, practiced, precise, deft, skillful
antonym: clumsy
compact,
trim, simple, well-designed, handy, elegant, natty
antonym: cumbersome