PLAUSIVE
approving, affirmative, approbative, approbatory, plausive
(adjective) expressing or manifesting praise or approval; “approbative criticism”; “an affirmative nod”
Source: WordNet® 3.1
Etymology
Adjective
plausive (comparative more plausive, superlative most plausive)
(rare) laudable
(obsolete) applauding; showing praise
(obsolete) plausible; specious
Source: Wiktionary
Plau"sive, a. Etym: [L. plaudere, plausum, to applaud.]
1. Applauding; manifesting praise. Young.
2. Plausible, specious. [Obs.] Shak.
Source: Webster’s Unabridged Dictionary 1913 Edition