unpretentious lacking pretension or affectation; "an unpretentious country church"; "her quiet unpretentious demeanor"
austere,
stern,
stark,
severe of a stern or strict bearing or demeanor; forbidding in aspect; "an austere expression"; "a stern face"
mere,
simple,
bare being nothing more than specified; "a mere child"
chaste morally pure (especially not having experienced sexual intercourse); "a holy woman innocent and chaste"
dry practicing complete abstinence from alcoholic beverages; "he's been dry for ten years"; "no thank you; I happen to be teetotal"
dry practicing complete abstinence from alcoholic beverages; "he's been dry for ten years"; "no thank you; I happen to be teetotal"
featureless lacking distinguishing characteristics or features; "the featureless landscape of the steppe"
homely lacking in physical beauty or proportion; "a homely child"; "several of the buildings were downright homely"; "a plain girl with a freckled face"
literal without interpretation or embellishment; "a literal depiction of the scene before him"
simple unornamented; "a simple country schoolhouse"; "her black dress--simple to austerity"
tailored,
trim severely simple in line or design; "a neat tailored suit"; "tailored curtains"
plain -
lacking embellishment or ornamentation; "a plain hair style"; "unembellished white walls"; "functional architecture featuring stark unornamented concrete"
pure in a state of sexual virginity; "pure and vestal modesty"; "a spinster or virgin lady"; "men have decreed that their women must be pure and virginal"
plain -
free from any effort to soften to disguise; "the plain and unvarnished truth"; "the unvarnished candor of old people and children"
Plain -
clearly revealed to the mind or the senses or judgment; "the effects of the drought are apparent to anyone who sees the parched fields"; "evident hostility"; "manifest disapproval"; "patent advantages"; "made his meaning plain"; "it is plain that he is no reactionary"; "in plain view"
obvious easily perceived by the senses or grasped by the mind; "obvious errors"
Plain -
lacking in physical beauty or proportion; "a homely child"; "several of the buildings were downright homely"; "a plain girl with a freckled face"
A plain is land with relatively low relief, that is flat or gently rolling. Prairies and steppes are types of plains, and the archetype for a plain is often thought of as a grassland, but plains in their natural state may also be covered in shrublands, woodland and forest, or vegetation may be absent in the case of sandy or stony plains in hot deserts. Types of flatlands for which the term is not generally used include those covered entirely and permanently by swamps, marshes, playas, or ice sheets.
OmegaWiki Dictionary
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Plain An extensive, broad tract of level or rolling, almost treeless land with a shrubby vegetation, usually at a low elevation.
Plain Having a surface without slope nor variations in altitude.
Plain To state complaints, discontent, displeasure, or unhappiness.
