a certain, an, any, any one, atomatic, atomiferous, atomistic, corpuscular, cyclic, diatomic, dibasic, either, embryonic, evanescent, exclusive, germinal, granular, heteroatomic, heterocyclic, hexatomic, homocyclic, impalpable, imperceptible, imponderable, inappreciable, indiscernible, individual, indivisible, infinitesimal, intangible, integral, invisible, irreducible, isobaric, isocyclic, isoteric, isotopic, lone, microcosmic, microscopic, molecular, monadic, monatomic, monistic, one, pentatomic, simple, single, singular, sole, solid, solitary, subatomic, tenuous, tetratomic, thin, triatomic, tribasic, ultramicroscopic, unanalyzable, undivided, uniform, unique, unitary, unseeable, whole