See more synonyms for justly on Thesaurus.com
  1. in a just manner; honestly; fairly: Deal justly with the prisoners.
  2. in conformity to fact or rule; accurately.
  3. deservedly; as deserved.

Origin of justly

Middle English word dating back to 1300–50; see origin at just1, -ly
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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Word Origin and History for justly

early 14c., "in an adjacent position, closely," from just (adj.) + -ly (2). Meanings "truthfully, honestly," "in an equitable manner, with justice, fairly" are from late 14c. Sense of "justifiably, with good reason" is from c.1400; that of "legally, legitimately, rightfully" is early 15c.

Online Etymology Dictionary, © 2010 Douglas Harper