Synonyms of least

1 Syllable

worst, first, last, third

2 Syllables

gutter, smallest, bottom, feeblest, fewest, meanest, poorest, short-end, tiniest, trivial, vapid, rearmost, littlest, lowest, piddling, laster, second, ender, lastest, nadir, niggling

3 Syllables

lattermost, finical, minutest, minute, endwise, atomic, aftermost, minimal, minimum

4 Syllables

unimportant, entry-level, microcosmic, molecular, microscopic, milk-and-water

6 Syllables

infinitesimal