deepest

The word 'deepest' is the superlative form of the adjective 'deep'. Its core morpheme, 'deep', originates from the Old English 'dēop', which itself descends from the Proto-Germanic 'deupaz', carrying the fundamental sense of depth, profundity, or extending far inward. This Germanic root is further traced back to the Proto-Indo-European base 'dheub-', meaning deep or hollow, a concept also evident in words like 'dive'. The suffix '-est' is the native English superlative marker, derived from Old English, used to denote the utmost degree of a quality. Thus, 'deepest' logically constructs its meaning by combining the ancient concept of profound depth with the grammatical marker for the highest extreme, evolving from a literal physical description to also encompass abstract intensities of feeling or thought.

Structure: deep (far down) + est (superlative suffix) - deep: From Old English 'dēop' (adjective), of Proto-Germanic origin; meaning profound, extending far down. - est: From Old English '-est', '-ost', the superlative suffix used to form the highest degree of adjectives and some adverbs.