cast-iron
Definition
Made of strong iron; also, something that is dependable or unchangeable.
日本語 強い鉄で作られたもの、または信頼できるもの
Example
"She has cast-iron willpower when it comes to sticking to her goals."
Made of strong iron; also, something that is dependable or unchangeable.
日本語 強い鉄で作られたもの、または信頼できるもの
"She has cast-iron willpower when it comes to sticking to her goals."