This part of the Polander site is devoted to the adjectives describing
People from Poland. If you should know of an occurrence in English of
such adjective, please send it with the exact source of the word to:
adjective@polander.org

• The Oxford English Dictionary. Second Edition. Prepared by J.A. Simpson and E.S.C. Weiner
  Volume XII Poise-Quelt Clarendon Press, Oxford 1989
  

Definitions:
Polan. Obs. [a. OF. Poul(a)in Polish, a Pole.] A Pole, a native of Poland.
1502 in Ellis Orig. Lett. Ser. 1. I. 50 The Hungaries, Boyams, and the Polans. 1604 T. Wright Passions 1. x.
44, I might discourse over … Italians, Polans, Germanes.

Poland wheat – p. 11

Hence Polander, a native of Poland, a Pole (obs.); also a Poland fowl.
Poland fowl - p. 11
Poland manna p. 11

Poless a Polish woman – p. 19

Poland. The name of town in Maine, U.S., used attrib. and absol. to designate the variety of mineral water
obtained from springs there. – p. 11

Poland mineral spring water – 1881

Polonese sb. And a. Obs. [ad. F. polonaise Polish, It. Polonese, f. med. L. Polonia Poland; see – ese.] – p.
44

Polonial a. and sb. [f. Polonia + - an.] = Polish – p. 45

1922 Blackw. Mag. June 801/2 A very intelligent-looking secretary to the Polonial Embassy to the Vatican
assured me [etc.].

Polonian, a. and sb. [f. Polonia + -an.]

A.        adj. Of Poland; = Polish a. Obs. Or arch.

1585 T. Washington tr. Nicholay’s Voy. Iv. Xiii. 126 b, A long cappe after the Polonian or Georgian fashion.
1655 Owen Vind. Evagelicae Wks. 1853 XII. 18 This Captain-general of the Polonian forces. 1776 Mickle tr.
Camoens’ Lusiad Introd. 55 He was a Polonian Jew by birth.
B. sb. 1. A native of Poland, a Pole. Arch.

• The New Shorter Oxford English Dictionary on Historical Principles. Edited by Lesley Brown.
  Volume 2 N-Z. Clarendon Press. Oxford, 1993
  

Definitions:
Polonese n. Pl. same. – A native of Poland, a Pole. – p. 2277
Polonian, a. & n. arch. M16. [f. med. L Polonia Poland + -an] A adj. Of Poland; Polish. A native or inhabitant
of Poland.
Polander – now rare or obscure. A native of Poland, a Pole.