| Term | Definition |
| impair | injure; hurt |
| impede | hinder; block |
| impermeable | not permitting passage through its substance; impervious |
| impervious | impenetrable; incapable of being damaged or distressed |
| implode | burst inward |
| inadvertently | unintentionally; by oversight; carelessly |
| incorporate | introduce something into a larger whole; combine; unite |
| indeterminate | uncertain; not clearly fixed; indefinite |
| indigence | poverty |
| indolent | lazy |
| inherent | firmly established by nature or habit |
| insensible | unconscious; unresponsive |
| insinuate | hint; imply; creep in |
| insularity | narrow-mindedness; isolation |
| inundate | overwhelm; flood; submerge |
| invective | abuse (noun) |
| irresolute | uncertain how to act; weak |
| itinerary | plan of a trip |
| lassitude | languor; weariness; depression |
| latent | potential but undeveloped; dormant; hidden |
| lethargic | drowsy; dull |
| levee | earthen or stone embankment to prevent flooding |
| levity | lack of seriousness or steadiness; frivolity |
| log | record of a voyage or flight; record of day-to-day activities |
| malingerer | one who feigns illness to escape duty |
| metamorphosis | change of form |
| negate | cancel out; nullify; deny |
| officious | meddlesome; excessively pushy in offering one's services |
| paragon | model of perfection (!) |
| pathological | pertaining to disease |
| paucity | scarcity |
| penchant | strong inclination; liking |
| plasticity | ability to be molded |
| porous | full of pores; like a sieve |
| preamble | introductory statement |
| precarious | uncertain; risky |
| propitiate | appease |
| proscribe | ostracize; banish; outlaw (!) |
| quibble | minor objection or complaint |
| recluse | hermit; loner |
| refractory | stubborn; unmanageable |
| reproach | express disapproval or disappointment |
| reprobate | person hardened in sin; devoid of a sense of decency |
| resolution | determination |
| resolve | determination; firmness of purpose |
| sage | person celebrated for wisdom (noun) |
| satiate | satisfy fully |
| saturate | soak thoroughly |
| secrete | hide away or cache; produce and release a substance into an organism |
| skeptic | doubter |
| spectrum | colored band produced when a beam of light passes through a prism |
| stigma | token of disgrace; brand |
| stint | be thrifty; set limits (verb) |
| stipulate | State clearly |
| stolid | dull; impassive |
| striated | marked with parallel bands; grooved |
| strut (N) | pompous walk |
| subside | settle down; descend; grow quiet |
| substantiate | establish by evidence; verify; support |
| supersede | cause to be set aside; replace; make obsolete |
| supposition | hypothesis; surmise |
| tangential | peripheral; only slightly connected; digressing |
| transgression | violation of a law; sin |
| venerate | revere |
| verbose | wordy |
| viable | practical or workable; capable of maintaining life |
| warranted | justified; authorized |
| welter | turmoil; bewildering jumble |
| whimsical | capricious; fanciful |