Roget's Thesaurus: Entry 935 (Flatterer)

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#935. Flatterer. -- N. flatterer, adulator; eulogist, euphemist; optimist, encomiast, laudator[Lat], whitewasher.

toady, toadeater[obs]; sycophant, courtier, Sir Pertinax MacSycophant; flaneur[Fr], proneur[Fr]; puffer, touter[obs], claqueur[Fr]; clawback[obs], earwig, doer of dirty work; parasite, hanger-on &c. (servility) 886.

yes-man, suckup, ass-kisser [vulgar], brown-noser [vulgar], teacher's pet.

Phr. pessimum genus inimicorum laudantes [Lat][Tacitus].