the compound adjective 'water-scarce' is a modern formation that transparently combines two english elements to describe a critical environmental condition. the first element, 'water', derives from the proto-germanic 'watōr', a fundamental term for the vital liquid, which has remained remarkably stable in meaning across germanic languages. the second element, 'scarce', entered english via anglo-norman from the vulgar latin 'excarpsus', meaning 'plucked out' or 'made rare', ultimately from latin 'excerpere' (to pick out). the compound's logic is direct and descriptive: it denotes a state where the essential resource of water is picked out or drawn away to the point of being insufficient, effectively creating a literal and figurative landscape of scarcity.

Structure: water (water) + scarce (insufficient) water (from old english 'wæter', meaning water, a liquid substance) + scarce (from old north french 'escars', meaning insufficient, meager).