plain

v.

[1]	complain , kick , sound off , quetch , kvetch

n.

[1]	field , champaign
[2]	knit , knit stitch , plain stitch
[3]	prairie , grassland , pasture , meadow-land , veld/veldt , pampas , campo , llano , savannah/savanna , steppe , tundra , champaign/campagna , heath , moor , moorland , plateau , flatland , down , downland , (Literary) wold , (Archaic/Literary) mead

adv.

[1]	obviously , evidently , manifestly , patently , apparently , plainly

adj.

[1]	flat , smooth , even , featureless , level , plane
[2]	clear , evident , simple , distinct , crystal clear , lucid , vivid , transparent , apparent , obvious , patent , self-evident , manifest , distinct , unmistakable/unmistakeable , unequivocal , unambiguous , understandable , intelligible , graphic , direct , in black and white
[3]	open , honest , straightforward , forthright , direct , frank , candid , blunt , outspoken , ingenuous , sincere , guileless , artless , unreserved
[4]	simple , apparent , evident , unadorned , undecorated , manifest , patent , unembellished , basic , unmistakable , austere , stark , unostentatious , colourless , drab , bare , unvarnished , Spartan
[5]	homely , unattractive , ordinary-looking , unlovely , ugly
[6]	unpatterned
[7]	sheer , unmingled , unmixed
[8]	unvarnished
[9]	bare , spare , unembellished , unornamented
[10]	homely