言うは易く行うは難し
いうはやすくおこなうはかたし (Iu wa yasuku okonau wa katashi)
Easy to say, hard to do / Easier said than done
例文 1基本の例文
毎朝走るって決めたけど、言うは易く行うは難しで、三日で終わった。
I decided to run every morning, but it was easier said than done — I quit after three days.
例文 2応用例
「敵将の首を取ってみせる」と豪語した足軽は、いざ戦場に立つと足がすくんだ。言うは易く行うは難し。
The foot soldier boasted, "I'll take the enemy general's head," but once on the battlefield, his legs froze. Easy to say, hard to do.