the adjective 'winnable' is a modern english formation, combining the native english verb 'win' with the productive latinate suffix '-able'. the old english root winnan originally carried a broader sense of struggling or contending, which naturally narrowed to the specific struggle for victory. the suffix '-able', entering english via old french from latin -abilis, is used to form adjectives indicating passive possibility. therefore, the literal construction "capable of being won" directly and logically yields the modern meaning, describing a contest, prize, or objective that is within reach of being secured through effort.

Structure: win (to achieve victory) + able (capable of being) win (old english winnan, meaning "to labor, toil, strive, fight") + able (latin -abilis, a suffix forming adjectives meaning "capable of, fit for, tending to")