onliest

The word 'onliest' is a nonstandard but historically traceable superlative of 'only'. Its core component, 'onli', descends from the Old English 'ānlic', a compound of 'ān' (one) and '-līc' (having the form of), thus literally meaning "one-like" or "single." The addition of the superlative suffix '-est', from the common Germanic superlative marker, intensifies this meaning to "the most single" or "the sole one." While 'only' itself solidified as both an adjective and adverb, the formation 'onliest' followed a regular but now obsolete pattern for creating emphatic or dialectal superlatives, illustrating how grammatical regularity can produce forms that fall outside standardized usage.

Structure: onli (one) + est (superlative suffix) - onli: Derived from Old English 'ānlic', meaning 'one-like' or 'single'. Its functional role is the adjectival base meaning 'sole' or 'single'. - est: A superlative suffix from Old English '-est', '-ost', used to form the highest degree of comparison.