c. 1300, "to vanquish, subdue, conquer," from Old French danter, variant of donter (12c., Modern French dompter) "be afraid of, fear, doubt; control, restrain," from Latin domitare, frequentative of domare "to tame" (see tame (v.)). Sense of "to intimidate, subdue the courage of" is from late 15c. Related: Daunted; daunting.
word-forming element meaning "lacking, cannot be, does not," from Old English -leas, from leas "free (from), devoid (of), false, feigned," from Proto-Germanic *lausaz (cognates: Dutch -loos, German -los "-less," Old Norse lauss "loose, free, vacant, dissolute," Middle Dutch los, German los "loose, free," Gothic laus "empty, vain"), from PIE root *leu- "to loosen, divide, cut apart." Related to loose and lease.