The word “inflammation” is derived from the Latin verb “inflammare”, which means “to set on fire”. This provides insight into the actual definition of inflammation, which is a protective response of the body to injury or infection. It is characterized by redness, warmth, swelling, and pain, and is the body’s attempt to remove harmful stimuli, such as damaged cells, irritants, or pathogens, and to begin the healing process.

1. Inadequate: Not sufficient, lacking in quality. Etymologically, this word comes from the Latin in- and adaequare, meaning "not equal".


2. Inanimate: Not alive; without life or animation. Etymologically, this word comes from the Latin in- and anima, meaning "without spirit".


3. Inaudible: Not able to be heard. Etymologically, this word comes from the Latin in- and audire, meaning "not to hear".


4. Illogical: Not rational, not based on sound reasoning. Etymologically, this word comes from the Latin illogicus, meaning "not reasonable".


5. Immaterial: Not composed of physical matter; having no material form. Etymologically, this word comes from the Latin in- and materia, meaning "without matter".


6. Impossible: Not able to be done or accomplished. Etymologically, this word comes from the Latin in- and possibilis, meaning "not able to be done".


7. Inaction: not taking action; inactive. Etymologically, it comes from the Latin, “inactus”, meaning “not active”.


8. Inadaptable: not able to adjust. Etymologically, it comes from the Latin, “inadaptabilis”, meaning “not able to be adapted”.


9. Impertinent: not appropriate; rude. Etymologically, it comes from the Latin, “impertinens”, meaning “not pertinent”.


10. Illiterate: not able to read; ignorant. Etymologically, it comes from the Latin, “illiteratus”, meaning “not literate”.


11. Impenetrable: not penetrable; impossible to understand. Etymologically, it comes from the Latin, “impenetrabilis”, meaning “not able to be penetrated”.


12. Impolite: not polite; rude. Etymologically, it comes from the Latin, “impolitus”, meaning “not polished”.


13. Incompatible: not compatible; unable to coexist. Etymologically, it comes from the Latin, “incomparabilis”, meaning “not equal”.


14. Impractical: not practical; not useful. Etymologically, it comes from the Latin, “impracticus”, meaning “not able to be done”.