思案顔

しあんがお

pensive (or worried) look on one's face

思案投首

しあんなげくび

being at one's wit's end, being (quite) at a loss (what to do)

鼻元思案

はなもとじあん はなもとしあん

superficial (shortsighted) way of thinking, half-baked (foolish, ill-advised) idea

鼻先思案

はなさきじあん はなさきしあん

superficial (shortsighted) way of thinking, half-baked (foolish, ill-advised) idea

喉元思案

のどもとじあん

superficial (shortsighted) way of thinking, half-baked (foolish, ill-advised) idea

思案に余る

しあんにあまる

to be at wit's end, to be at a loss for what to do

思案に暮れる

しあんにくれる

to be lost in thought

恋は思案の外

こいはしあんのほか

Love is without reason

引っ込み思案

ひっこみじあん

reserved, introverted, reticent, shy, withdrawn

虚仮の後思案

こけのあとじあん

hindsight is 20-20 (even for a fool)

色事は思案の外

いろごとはしあんのほか

love and reason do not go together

此処が思案のし所

ここがしあんのしどころ

This is the point we need to think about

凝っては思案に能わず

こってはしあんにあたわず

too much thinking gets you nowhere; excessive enthusiasm clouds one's judgment

案

あん

idea, plan, thought

代案

だいあん

alternate plan

議案

ぎあん

legislative bill, measure

教案

きょうあん

lesson or teaching plan

対案

たいあん

counter-proposal, counter-suggestion

成案

せいあん

definite plan