feverish

the word 'feverish' is a transparent english formation, combining the noun 'fever' with the adjectival suffix '-ish'. the root 'fever' itself has a long journey, entering old english from latin febris, which is of uncertain origin but may be connected to proto-indo-european roots meaning 'to be warm' or 'to smoke'. the suffix '-ish' is a native english element from old english -isc, used to denote origin or character. thus, the literal construction 'fever-like' evolved seamlessly into its modern meanings, first describing the physical symptoms of elevated body temperature and later extending metaphorically to describe any state of agitated, restless, or overly excited activity reminiscent of the discomfort and urgency of a fever.

Structure: fever (high body temperature) + ish (having the qualities of) fever (from old english fēfor, from latin febris, meaning 'fever'). ish (a suffix of old english origin used to form adjectives meaning 'of the nature of' or 'somewhat like').