I . a.
1.
Single, uncombined, unmingled, uncompounded, unmixed, elementary, bare, mere, incomplex, unblended.
2.
Plain, unadorned, unstudied, unaffected, unvarnished, natural, chaste, neat, unembellished.
3.
Artless, undesigning, sincere, unaffected, unconstrained, frank, open, downright, inartificial, plain, single-minded, unsophisticated, straightforward, true, ~-hearted, ~-minded, naïve .
4.
Silly, foolish, weak, credulous, shallow, unwise, unsophisticated, homely.
5.
Unmistakable, clear, intelligible.
II . n.
Medicinal plant.