The word 'unresponsiveness' is built upon the core Latin verb 'respondere', meaning to answer or pledge back. The prefix 'un-', a common Germanic negator, reverses the quality, creating the adjective 'unresponsive' to describe something that does not answer or react. Finally, the native English suffix '-ness' is appended to nominalize this adjective, forming a word that precisely denotes the abstract state of not reacting. This construction elegantly layers a Latin action root with Germanic modifiers to create a specific modern psychological and behavioral term.

Structure: un (not) + respons (respond) + iveness (state or quality) - un: A prefix of Germanic origin (Old English) meaning "not," used to form negatives. - respons: A root derived from Latin 'respondere', meaning "to answer, to promise in return." - iveness: A suffix complex combining '-ive' (forming adjectives meaning "tending to") and '-ness' (forming nouns indicating a state or quality), both of Germanic origin via Old English.