The Collaborative International Dictionary of English v.0.48:
Flatter \Flat"ter\ (fl[a^]t"t[~e]r), v. t. [imp. & p. p.
Flattered; p. pr. & vb. n. Flattering.] [OE. flateren,
cf. OD. flatteren; akin to G. flattern to flutter, Icel.
fla[eth]ra to fawn, flatter: cf. F. flatter. Cf. Flitter,
1. To treat with praise or blandishments; to gratify or
attempt to gratify the self-love or vanity of, esp. by
artful and interested commendation or attentions; to
blandish; to cajole; to wheedle.
When I tell him he hates flatterers,
He says he does, being then most flattered. --Shak.
A man that flattereth his neighbor, spreadeth a net
for his feet. --Prov. xxix.
Others he flattered by asking their advice.
2. To raise hopes in; to encourage or favorable, but
sometimes unfounded or deceitful, representations.
3. To portray too favorably; to give a too favorable idea of;
as, his portrait flatters him.