unformed

characterless, featureless, nondescript

chaotic, disorganized, incoherent, systemless, unordered, unorganized

dim, fuzzy, hazy, inchoate, indefinite, indeterminate, indistinct, indistinguishable, murky, nebulous, obscure, unclear, undefined, undetermined, vague

babyish, childish, infantile, infantilized, infantine

boyish, girlish, kiddish, young, youngish, youthful

ingenuous, innocent, naive (or naïve), tender

unknowing, unseasoned, unsophisticated, untrained, untried