SMUGLY

smugly

(adverb) in a smug manner; “the bureaucrats explained smugly that the facts provided by their own experts show no cause for concern”

Source: WordNet® 3.1

Etymology

Adverb

smugly (comparative more smugly, superlative most smugly)

In a self-satisfied manner.

He was smirking smugly at us.

Source: Wiktionary

Smug"ly, adv.

Definition: In a smug manner. [R.] Gay.

SMUG

Smug, a. Etym: [Of. Scand. or Low German origin; cf. LG. smuck, G. schmuck, Dan. smuk, OSw. smuck, smöck, and E. smock, smuggle; cf. G. schmuck ornament. See Smock.]

Definition: Studiously neat or nice, especially in dress; spruce; affectedly precise; smooth and prim. They be so smug and smooth. Robynson (More's Utopia). The smug and scanty draperies of his style. De Quincey. A young, smug, handsome holiness has no fellow. Beau & Fl.

Smug, v. t. [imp. & p. p. Smugged; p. pr. & vb. n. Smugging.]

Definition: To make smug, or spruce. [Obs.] Thus said, he smugged his beard, and stroked up fair. Dryton.

Source: Webster’s Unabridged Dictionary 1913 Edition