Across
- 4. – Tending to obstruct or harm; literally "like an enemy," from the Latin inimicalis, rooted in inimicus (enemy), which is in- (not) plus amicus (friend).
- 5. – A lengthy and aggressive speech; derived from the Italian arringo, which referred to the public square or assembly where such speeches were delivered to a crowd.
- 9. – Persisting tirelessly; literally "not able to be tired out," from the Latin indefatigabilis, combining in- (not) with fatigare (to tire).
- 12. – Unwilling or refusing to change one's views; originally from the Spanish los intransigentes, based on the Latin in- (not) and transigere (to come to an agreement).
- 13. – Very attentive to and concerned about accuracy and detail; originally meaning "disdainful" or "squeamish" from the Latin fastidiosus, rooted in fastidium (loathing).
- 15. – Just begun and so not fully formed or developed; meaning "commenced," from the Latin inchoatus, the past participle of inchoare (to begin).
- 17. – Impossible to understand or interpret; literally "that which cannot be searched," from the Late Latin inscrutabilis, combining in- (not) and scrutari (to search or examine).
- 18. – A person who attacks cherished beliefs or established institutions; literally an "image breaker," from the Greek eikon (image) and klastes (breaker).
- 19. – Lacking significance through having been overused; derived from the village of Hackney, where horses were let out for hire, implying something used until it is common or worn out.
Down
- 1. – Unchanging over time or unable to be changed; formed by the Latin immutabilis, combining in- (not) and mutare (to change).
- 2. – Acting or done quickly and without thought; originally "violent or forceful," from the Latin impetuosus, based on impetus (an attack or rapid motion).
- 3. – Excessively talkative, especially on trivial matters; a "chattering" quality from the Latin garrulus, based on the verb garrire (to chatter or prattle).
- 6. – Intensively enthusiastic or passionate; its "burning" intensity comes from the Latin fervidus (glowing), which stems from fervere (to boil).
- 7. – Based on a mistaken belief or unsound reasoning; literally "full of deceit," deriving from the Latin fallaciosus, from fallax (deceptive) and fallere (to deceive).
- 8. – To overwhelm or flood; literally "to move in waves," from the Latin inundatus, from unda (a wave).
- 9. – Lacking flavor or vigor; essentially "without taste," from the Latin insipidus, combining in- (not) and sapidus (tasty or wise).
- 10. – Fond of company and sociable; essentially "belonging to a flock," from the Latin gregarius, rooted in grex (flock or herd).
- 11. – Unfortunate or unlucky; a combination of the Old Norse happ (luck or good fortune) and the English suffix -less (without).
- 14. – Having a tendency to be easily angered; "prone to anger," from the Latin irascibilis, rooted in the verb irasci (to grow angry) and ira (anger).
- 16. – Having a red or flushed complexion or being excessively intricate; literally "flowery," originating from the Latin floridus, from flos (flower).