'wateriness' originates from English, specifically from the noun 'water' combined with the suffix '-ness', where 'water' meant 'the liquid water' and '-ness' formed nouns denoting a state or quality.

'wateriness' developed from Middle English formations such as 'waternesse' or 'waterinesse' (from Old English 'wæter' + '-nes(s)e') and eventually became the modern English word 'wateriness'.

Initially it meant 'the state of being full of or consisting of water' and has evolved to include broader senses such as 'thinness or lack of substance due to excess water or dilution'.