fervid

The word fervid originates from the Latin adjective fervidus, meaning "boiling, hot, glowing," which itself derives from the verb fervēre (to boil, seethe). This Latin root can be traced further back to the Proto-Indo-European root bhreuə-, meaning "to bubble, boil, effervesce." The semantic journey from a literal, physical heat to a metaphorical, emotional one is direct and powerful. Thus, in modern English, fervid retains this core logic, describing a person or their feelings as being so intensely passionate that they are metaphorically "boiling over" with enthusiasm or zeal.

Structure: ferv (hot, boil) + id (adjective suffix) - ferv: From Latin fervēre, meaning "to boil, be hot, glow." It functions as the core root conveying the sense of heat. - id: A suffix of Latin origin (-idus) used to form adjectives, meaning "having the quality of" or "tending to be."