Synonyms for Uncluttered:

adj.

all (adjective)
unlittered.
clean (adjective)
neat, plain, simple, clear.
open (adjective)
bare.
orderly (adjective)
tidy, clean.
pure (adjective)
blameless, purebred, atomic, unsullied, clear, decent, indivisible, stainless, stark, unalloyed, angelic, basal, simple, austere, sinless, prime, guiltless, innocent, honorable, elemental, undiluted, monolithic, primal, formative, clean, faultless, chaste, undefiled, unblemished, aboriginal, virtuous, plain, fundamental, foundational, untarnished, elementary, spotless, bare, irreducible, pure, white, untainted, nascent, basic, Simon-pure, unadulterated, essential, unadorned, immaculate, primary.
shipshape (adjective)
well-kept, ordered.
succinct (adjective)
casual, intelligible, simple, Plain-spoken, frank, honest, direct, candid, unadorned, stark, clear, straightforward, ordinary, unpretentious, bald, folksy, unpoetical, outspoken, informal, prosaic, blunt.
vanilla (adjective)
elementary, folksy, unpretentious, austere.

n.

tidy (noun)
organized, just so, ordered, neat, Manicured, well-kept.
uncluttered (noun)
unlittered, tidy.

Other synonyms:

tidy
organized, tidy, well-kept, ordered, Manicured.
Other relevant words:
ordered, tidy, well-kept, organized, Manicured, neat, unlittered.