the word "uninvited" is a modern english formation built from a core latin verb and germanic affixes. the latin root invitare, meaning "to ask" or "to summon," entered english via old french as "invite." the germanic negative prefix "un-," one of the most productive in english, was attached to the past participle "invited" to create the adjective. the "-ed" suffix here functions adjectivally, describing the state of not having been asked. thus, the literal construction "not asked" perfectly captures the modern meanings of being unwelcome at an event or of intrusive thoughts.

Structure: un (not) + invit (ask/call) + ed (adjective suffix) - un: a prefix of germanic origin (old english) meaning "not," used to give a negative or opposite force to adjectives and participles. - invit: a root from latin invitare meaning "to ask, to summon, to entertain." - ed: a suffix of germanic origin (old english) used to form adjectives from verbs, indicating a state or condition.