laborious

The word 'laborious' is a direct inheritance from the Latin laboriosus, meaning 'full of labor, toilsome'. The Latin root labor itself is of uncertain Proto-Indo-European origin, though it is deeply embedded in Latin vocabulary relating to work, hardship, and childbirth. The suffix -osus was a productive way to form adjectives indicating an abundance of a quality. The semantic journey is straightforward: from the literal state of being 'full of hard work' (labor), the term evolved to describe any task characterized by such effort, and by metaphorical extension, any manner or style that appears effortful and strained.

Structure: labor (work) + ious (adjective suffix) - labor: From Latin labor (work, toil, exertion, fatigue). The functional role is the core root conveying the sense of 'work'. - ious: A suffix of Latin origin (-osus) used to form adjectives meaning 'full of' or 'characterized by'. Its functional role is to convert the noun into an adjective.