Similar word to zilchest:

diminutive, feeble, fragile, frail, half-pint, inconsequential, inferior, infirm, little, measly, minor, niggling, nothing, paltry, peanut, peewee, petty, picayune, piddling, pint-sized, runt, shrimp, small time, small-fry, stunted, tiny, trifling, trivial, two-bit, unconsequential, underfed, undersized, undeveloped, unsound, unsubstantial, weak, weakly, wee, worthless, zero, zilch