The word 'timorous' has a direct lineage from Latin, entering English in the late Middle English period via Anglo-French. Its core, 'timor,' is the Latin noun for fear or dread, itself derived from the verb timere (to fear). The suffix '-ous,' of Latin origin, attaches to nouns to create adjectives meaning "full of" or "possessing the qualities of." Thus, the literal construction "full of fear" provides a perfectly transparent logic for its modern meaning of being easily frightened or showing a lack of courage. This etymological clarity makes 'timorous' a classic example of a Latinate descriptor for a state of apprehension.

Structure: timor (fear) + ous (adjective suffix) - timor: From Latin timor (fear, dread). Functional role: The core root conveying the sense of fear. - ous: From Latin -osus (full of, characterized by). Functional role: An adjective-forming suffix meaning "having the quality of."