Stubborn, unmanageable, or resistant to treatment; as a noun, refers to heat-resistant materials used in high-temperature applications. Medical usage describes conditions resistant to treatment.
From Latin 'refractorius' meaning 'stubborn,' derived from 'refringere' meaning 'to break up' or 'break open.' The sense evolved from physical breaking to metaphorical resistance to control or change.
The word beautifully captures how some things 'break apart' attempts to control them, whether it's a stubborn child, a resistant disease, or materials that won't melt under extreme heat. This resistance can be both frustrating and remarkably useful.
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