Meaning of 大層 in Japanese

Definition of 大層

たいそう(taisou) 【大層】

(adj-na, adv, n) very much; exaggerated; very fine
これはたいそう快適な暖炉ですね。
This is a very nice fireplace.

ごたいそう(gotaisou) 【御大層 ·ご大層】

His appearance has changed so much that you may well not recognize him.

ロシア語ロシアごは大層たいそう学びにくい。

Russian is very difficult to learn.