the word 'thuggish' is a modern english formation, derived from the noun 'thug' with the addition of the adjectival suffix '-ish'. the noun 'thug' entered english in the early 19th century from hindi 'ṭhag', which referred to a member of a religious fraternity of robbers and assassins in india. the suffix '-ish' is a native english element from old english '-isc', commonly used to form adjectives denoting origin, character, or tendency. therefore, 'thuggish' literally means "having the character of a thug," evolving from a specific historical term for a criminal cult member to a general descriptor for brutal and violent behavior.

Structure: thug (violent criminal) + ish (adjective-forming suffix) thug: origin: hindi (ṭhag, meaning swindler, thief). functional role: root, providing the core meaning of a violent person. ish: origin: old english (-isc). functional role: suffix, used to form adjectives meaning "having the qualities of" or "resembling."