ill-informed

the word is a modern english compound adjective formed from the adverb 'ill,' which descends from old english with a sense of "badly" or "wrongly," and the past participle 'informed,' from latin informare ("to shape, give form to, instruct"). the literal combination "badly shaped or instructed" evolved logically into the abstract meaning of possessing inadequate or incorrect knowledge. this construction follows a common pattern in english where 'ill-' is prefixed to participles (e.g., ill-advised, ill-prepared) to denote a poor or deficient state. the term captures the concept that the information one has received or acquired is fundamentally flawed, leading to a mistaken understanding.

Structure: ill (badly) + informed (having knowledge) ill (from Old English ylle, meaning "bad, evil"; functions as a negative/pejorative prefix) + informed (from Latin informare, meaning "to shape, train, instruct"; functions as the past participle/adjectival base meaning "having knowledge")