The Collaborative International Dictionary of English v.0.48:

Statesmanlike \States"man*like`\ (-l[imac]k`), a.
   Having the manner or wisdom of statesmen; becoming a
   statesman.
   [1913 Webster]

WordNet (r) 3.0 (2006):

statesmanlike
    adj 1: marked by the qualities of or befitting a statesman; "a
           man of statesmanlike judgment"; "a statesmanlike solution
           of the present perplexities"-V.L.Parrington [syn:
           statesmanlike, statesmanly] [ant: unstatesmanlike]

Moby Thesaurus II by Grady Ward, 1.0:

67 Moby Thesaurus words for "statesmanlike":
   Daedalian, adept, adroit, apt, artistic, authoritative, bravura,
   brilliant, civic, clean, clever, coordinated, crack, crackerjack,
   cunning, cute, daedal, deft, dexterous, dextrous, diplomatic,
   excellent, expert, fancy, geopolitical, good, goodish,
   governmental, graceful, handy, ingenious, magisterial, masterful,
   masterly, neat, no mean, politic, political, politico-commercial,
   politico-diplomatic, politico-economic, politico-geographical,
   politico-judicial, politico-military, politico-moral,
   politico-religious, politico-scientific, politico-social,
   politico-theological, professional, proficient, quick, quite some,
   ready, resourceful, skillful, slick, some, statesmanly, stylish,
   suffragist, tactful, the compleat, the complete, virtuoso,
   well-done, workmanlike