Etymology
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obsequious (adj.)

late 15c., "prompt to serve, meekly compliant with the will or wishes of another, dutiful," from Latin obsequiosus "compliant, obedient," from obsequium "compliance, dutiful service," from obsequi "to accommodate oneself to the will of another," from ob "after" (see ob-) + sequi "to follow" (from PIE root *sekw- (1) "to follow"). Pejorative sense of "fawning, sycophantic, unduly compliant" had emerged by 1590s. Related: Obsequiously; obsequiousness (mid-15c.).

updated on July 26, 2019

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Definitions of obsequious from WordNet

obsequious (adj.)
attempting to win favor from influential people by flattery;
Synonyms: bootlicking / fawning / sycophantic / toadyish
obsequious (adj.)
attentive in an ingratiating or servile manner;
obsequious shop assistants
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.