愚図愚図[guzuguzu] slowly
闇愚[angu] imbecility
愚か[oroka] foolish
愚かしい[orokashii] foolish
愚挙[gukyo] foolish undertaking

愚行[gukou] folly
愚妻[gusai] wife
愚人[gujin] fool
愚生[gusei] (primarily used in letters, etc.) I
愚癡[guchi] idle complaint

と考えられる[tokangaerareru] one can think that ...
一考[ikkou] consideration
勘考[kankou] consider
考え[kangae] thinking
考えてみれば[kangaetemireba] if you think about it

考える[kangaeru] to consider
考え込む[kangaekomu] to ponder
考え事[kangaegoto] (deep) thinking
考え出す[kangaedasu] to think out
考え直して[kangaenaoshite] On second thoughts ...