The word "一味" is formed by combining the numeral "一" (meaning "one") with the noun "味" (meaning "flavor" or "taste"), creating a compound that literally denotes "one flavor". This literal sense metaphorically extends to indicate a single, unchanging method or perspective, hence its modern usage as an adverb meaning "blindly" or "persistently". The formation is a direct morphological combination where "一" modifies "味" to express a unified concept.