Synonyms for Least:

adj.

little (adjective)
slight, sparse, scant.
shortest (adjective)
lowest.

adv.

little (adverb)
barely.

n.

incidental, lesser, secondary, ancillary, collateral, second, in descending order, subordinate, subsidiary. slight, trivial, niggling, mere, scant, few, only, piddling, finical, unimportant, sparse, barely. in any event (noun)
at any rate, with no less than, anyhow.
smallest (noun)
infinitesimal, molecular, minute, microscopic, atomic.

Other synonyms:

less, lesser. below.

Usage examples for least

  1. At least I have." – April Hopes by William Dean Howells Last Updated: February 27, 2009
  2. No one, and least of all, my father, must know that I work here. – The Complete Historical Romances of Georg Ebers by Georg Ebers
  3. At least let us know that you are happy." – The Captives by Hugh Walpole