形容詞 proverbial:

1. of or relating to or resembling or expressed in a proverb
2. widely known and spoken of

1. The conditioned response, once it is firmly established, can be extinguished dozens of times, but it sill always return, like the proverbial bad penny.
   條件反射一經(jīng)形成，雖然可以一次又一次地壓制下去，但是它總會(huì)重新再現(xiàn)，真是擺也擺不脫扔也扔不掉。
2. He is the proverbial square peg in a round hole.
   他正是諺語(yǔ)中所說(shuō)的那種方枘圓鑿不得其所的人。

pro.ver.bi.al

adj.（形容詞）
Of the nature of a proverb.
諺語(yǔ)的：諺語(yǔ)的性質(zhì)的
Expressed in a proverb.
用一句諺語(yǔ)表示的
Widely referred to, as if the subject of a proverb; famous.
出名的：被廣泛地提到的，好象諺語(yǔ)的主題一樣；著名的

【引伸】
prover.bially
adv.（副詞）