na-adjective, noun
strong-backed; having a strong lower back
Literally describes a physically strong lower back or core; can also imply physical resilience.
彼は腰強で、重い荷物も楽に持ち上げる。
He has a strong back and can lift heavy loads with ease.
na-adjective, noun
stubborn; persevering; tenacious
Figurative use: describes a person who is mentally tough, unyielding, or persistent, like having a strong 'backbone'.
彼女は腰強で、一度決めたことは最後までやり遂げる。
She is tenacious and sees through whatever she decides to do.
na-adjective, noun
viscous; elastic and sticky; chewy
Describes a texture that is thick, sticky, and stretchy, like mochi or certain doughs. This sense is less common and may be regional or specialized.
この餅は腰強で、噛みごたえがある。
This mochi is chewy and has a satisfying texture.
Compound of 腰 (こし, 'lower back, hips') and 強 (つよ, stem of 強い 'strong'). The figurative senses derive from the idea of having a strong 'backbone' or core.