The headword (a single word in the Greek) occurs in the passage quoted, Aristophanes, Peace 44 (web address 1) -- where Holwerda inserts this Suda entry as a scholion ad loc.. See also e.g. an instance of it in an Antiphon, who is either -- provided they are different! -- the orator (fr. 162 Sauppe) or the sophist (fr. 105 DK).
For similar compounds cf. dokhsi/nous Callias fr. 27 Kock (now 34 K.-A.); dokhside/cios Pherecrates fr. 154 Kock (now 163 K.-A.).
For the topic of youngsters foolishly assuming a sage air cf. Aristophanes, Knights 1375-1380 (web address 2), Clouds 1052-1054 (web address 3).