Illimitable
In a sentence: His strength is illimitable.
Limitless
Invincible
In a sentence: The tanks armor was invincible.
Invulnerable; Unbeatable
Oblivious
In a sentence: He was completely oblivious to anything that had just been said to him.
Unaware; Inattentive
Parry
In a sentence: The swordsman had to parry the attack.
Quiver
In a sentence: The dog was quivering in fear.
To shake slightly, tremble, vibrate
Impecunious
In a sentence: Our family is very impecunious even though we all work our hardest.
Poor, destitute, penniless
Insubstantial
In a sentence: Her efforts were insubstantial.
Modest; Insignificant
Naive
In a sentence: Her naive attitude made many people think she was younger than she actually was.
Foolishly simple; Childlike
Pedant
In a sentence: The pedant practically only worked on schoolwork.
Uninspired, boring academic
Pungent
In a sentence: The pungent smell was leaking from the bathroom.
Strong or sharp in smell or taste
Importune
In a sentence: He importuned for more cookies.
To ask repeatedly, beg
Insolent
In a sentence: He is such an insolent fool.
Insulting and arrogant
Neutrality
In a sentence: He expressed his neutrality by ignoring everyone.
Disinterest; Impartiality
Pathogenic
In a sentence: The bacteria is thought to be pathogenic.
Causing disease
Query
In a sentence: Her query was very well thought out.
Question
Imposing
In a sentence: His presence is very imposing.
Dignified; Grand
Intimation
In a sentence: His expression gave an intimation as to what he was implying.
Clue; Suggestion
Mnemonic
In a sentence: Her mnemonic capabilities were astounding.
Relating to memory; Designed to assist memory
Pensive
In a sentence: She was always quite pensive and treated people respectfully.
Thoughtful
Ravenous
In a sentence: The cats ravenous behavior made me believe it was feeding time.
Extremely hungry
Hypochondria
In a sentence: She fueled her hypochondria by reading articles about rare diseases.
Unfounded belief that one is often ill
Introspective
In a sentence: He is introspective and often spends lots of time meditating.
Contemplating one's own thoughts and feelings
Nebulous
In a sentence: The sentence was very nebulous.
Unclear; Vague; Indefinite
Pejorative
In a sentence: His pejorative remarks were very irritating and annoying.
Degrading; Derogatory; Negative
Rancorous
In a sentence: He is very rancorous and aggressive.
Antagonistic; Hostile; Spiteful