Synonyms of unclassifiable

1 Syllable
dull
2 Syllables
vague, garden, common, empty, mousy
3 Syllables
nondescript, colorless
4 Syllables
unclassified, featureless, borderline, ordinary, uninspiring, characterless
5 Syllables
uninteresting, indescribable, unexceptional, unremarkable, unmemorable
6 Syllables
indeterminate