a.
1.
Ignorant, unlearned, untaught, unskilful, rude. [ Usually followed by of . ]
2.
Inartificial, simple, natural, plain, unadorned, without marks of art.
3.
Unaffected, plain, honest, frank, fair, open, candid, naive , guileless, simple, sincere, true, unsophisticated, ingenuous, undesigning, truthful, trustful, unsuspicious, confiding, single-minded, simple-hearted, simple-minded, open-hearted, straightforward.