jmdict 1004200 Active (id#2180547)
けど [spec1] ； けども
  1. [conj,prt]
    • but
    • however
    • although
History:
    • A 2022-03-06 19:16:32 Robin Scott
    • Comments
      けんど is 関西方言 according to daijr. I'll make a separate entry for it.
    • Diff
      @@ -10,3 +9,0 @@
-</r_ele>
-<r_ele>
-<reb>けんど</reb>
    • A* 2022-03-05 05:58:32 Jim Breen
    • Comments
      So move out けれど and けれども, and leave the others? I'll set that up and see if it works.
    • Refs
      けど	264538469
けれど	25837638
けれども	12292892
けども	3084936
けんど	52699
    • Diff
      @@ -7,8 +6,0 @@
-</r_ele>
-<r_ele>
-<reb>けれど</reb>
-<re_pri>ichi1</re_pri>
-</r_ele>
-<r_ele>
-<reb>けれども</reb>
-<re_pri>ichi1</re_pri>
    • A* 2022-02-12 06:26:22 Marcus Richert
    • Comments
      different levels of politeness. different registers. 　けれども and けれど should probably be [pol] or [form] tagged.
it's not like けど can just be replaced with any of the others in any sentence (or vice versa). It's like having だ and です in the same entry (which we previously did in んだ and んです but we ended up splitting it). I just think it's confusing.
    • Refs
      daijs
[補説]「けれども」は中世末、形容詞活用の已然形語尾に接続助詞「ども」が付いてできたもの。近世前期になると、くだけた感じを伴う「けれど」「けど」が生じ、後期には、「けども」が成立した。

https://hinative.com/ja/questions/168002
丁寧さの違いです。
↑ていねい
「けれども」
「けれど」
「けども」
「けど」
↓ていねいではない
敬語を使う相手には、上の二つを使います。
https://hinative.com/ja/questions/1968834
けれどもはけどより丁寧です
    • A* 2022-02-12 03:57:37 Jim Breen
    • Comments
      I was waiting for a case to be made. Both GG5 and ルミナス simply point けど to their けれど(も) entries. I don't think a split is needed.
GG5 has a second sense with the explanaion "〔単に接続的に, あるいは特別の意味なしに〕".  A little hard to gloss.
    • A* 2021-12-26 11:48:25 Marcus Richert
    • Comments
      I suggest splitting out けれど,けども けれども
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