atomic, back-burner, corpuscular, dinky, dispensable, embryonic, evanescent, germinal, granular, immaterial, impalpable, imperceptible, imponderable, inadequate, inconsequential, inconsiderable, indiscernible, inessential, inferior, infinitesimal, insensible, insignificant, insufficient, intangible, invisible, irrelevant, little, microcosmic, microscopic, minor, minute, molecular, negligible, nonessential, not vital, petit, scanty, scrimpy, skimpy, small, subatomic, technical, tenuous, thin, ultramicroscopic, unapparent, unappreciable, unessential, unimpressive, unnoteworthy, unobservable, unperceivable, unseeable