Not wise in the ways of the world:
— Either too unsophisticated or too honest to promise more than he could deliver.

synonym: unworldly.

Roget 42: simple, uniform, of a piece [Fr.], homogeneous, single, pure, sheer, neat.    unmixed, unmingled^†, unblended, uncombined, uncompounded; elementary, undecomposed; unadulterated, unsophisticated, unalloyed, untinged^†, unfortified, pur et simple [Fr.]; incomplex^†.    free from, exempt from; exclusive.    ... show more

Roget 494: real, actual etc. (existing) 1; veritable, true; right, correct; certain etc. 474; substantially true, categorically true, definitively true &c.; true to the letter, true as gospel; unimpeachable; veracious etc. 543; unreconfuted^†, unconfuted^†; unideal^†, unimagined; realistic.    exact, accurate, definite, precise, well-defined, just, just so, so; strict, severe; close etc. (similar) 17; literal; rigid, rigorous; scrupulous etc. (conscientious) 939; religiously exact, punctual, mathematical, scientific; faithful, constant, unerring; curious, particular, nice, delicate, fine; clean-cut, clear-cut.    verified, empirically true, experimentally verified, substantiated, proven (demonstrated) 478.    rigorously true, unquestionably true.    true by definition.    genuine, authentic, legitimate; orthodox etc. 983.1; official, ex officio.    pure, natural, sound, sterling; unsophisticated, unadulterated, unvarnished, unalloyed, uncolored; in its true colors; pukka^†.    well-grounded, well founded; solid, substantial, tangible, valid; undistorted, undisguised; unaffected, unexaggerated, unromantic, unflattering.    ... show more

Roget 703: artless, natural, pure, native, confiding, simple, lain, inartificial^†, untutored, unsophisticated, ingenu^†, unaffected, naive; sincere, frank; open, open as day; candid, ingenuous, guileless; unsuspicious, honest etc. 939; innocent etc. 946; Arcadian^†; undesigning, straightforward, unreserved, aboveboard; simple-minded, single-minded; frank-hearted, open-hearted, single-hearted, simple-hearted.    free-spoken, plain-spoken, outspoken; blunt, downright, direct, matter of fact, unpoetical^†; unflattering.    ... show more

Lacking complexity:
— An unsophisticated machine.

synonym: uncomplicated.

Awkwardly simple and provincial:
— The nightlife of Montmartre awed the unsophisticated tourists.

synonyms: bumpkinly, hick, rustic.