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Synonyms for Meek (same or very similar meaning)

WordNet sense 1 (very docile):
tame

WordNet sense 2 (willing to be taught or led or supervised or directed):
docile

WordNet sense 3 (humble in spirit or manner; suggesting retiring mildness or even cowed submissiveness):
mild, modest

WordNet sense 4 (marked by meekness or modesty; not arrogant or prideful):
humble

WordNet sense 5 (evidencing little spirit or courage; overly submissive or compliant):
spiritless

WordNet sense 6 (inclined or willing to submit to orders or wishes of others or showing such inclination):
submissive


From the ODE community, based on WordNetadd/edit