[Meaning] most/very energetic.[1] "[...] which of course [seemed?] to have become the deliberation most effective."[2] And elsewhere: "this he used to do discreetly and at the same time effectively."[3]
*pragmatikw/taton: e)nerghtikw/taton. o(\ dh\ kai\ pragmatikw/taton gegone/nai to\ diabou/lion. kai\ au)=qis: tou=to de\ e)poi/ei nounexw=s a(/ma kai\ pragmatikw=s. 
The headword, presumably extracted from the first quotation given, is the superlative degree, neuter nominative/accusative singular (and masculine accusative singular), of the adjective 
pragmatiko/s, -h/, -o/n, 
fit for action, effective; see generally LSJ s.v.
[1] The gloss is the same form as the headword, but from the adjective 
e)nerghtiko/s, 
able to act upon, energetic; cf. 
epsilon 635 (gloss) and see generally LSJ s.v. 
[2] 
Polybius fr. 203 (Büttner-Wobst). [Its beginning, 
o(\ dh\ kai/, has been suspected as faulty. In her critical apparatus Adler notes that Bernhardy suggested 
o(\ dh\ kai\ e)do/kei, whereas Hultsch opted for 
e)do/kei alone.]
[3] 
Polybius fr. 204 (Büttner-Wobst), containing an adverb related to the headword. Büttner-Wobst (p. 541n) notes that Valesius [= Henri de Valois 1603-1676, classical historian and philologist] attributed both it and the quotation at 
pi 2394 (q.v.) to 
Polybius.
T. Büttner-Wobst, ed., Polybii Historiae, vol. IV, Teubner: Leipzig, 1904
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