Meaning of よくよく in Japanese

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Definition of よくよく

よくよく(yokuyoku) 【翌々 ·翌翌】

よくよく(yokuyoku) 【良く良く ·能く能く ·善く善く】

(adv) exceedingly; very
そんな話にだまされるなんて、よくよくおめでたいね。
You must be very simple to be taken in by such a story.

よくよく(yokuyoku) 【翼翼 ·翼々】

しょうしんよくよく(shoushinyokuyoku) 【小心翼々 ·小心翼翼】

よくよくじつ(yokuyokujitsu) 【翌々日 ·翌翌日】

よくよくねん(yokuyokunen) 【翌々年 ·翌翌年】

よくよくげつ(yokuyokugetsu) 【翌々月 ·翌翌月】

When the bartender totals the bill for a customer who is drunk and angry, he must be very careful to mind his P's and Q's.

You must be very simple to be taken in by such a story.

Well do I remember it.