1. Idealistic without regard to practicality; impractical. 2. Impulsive: tending to act on whims or impulses. “It was clearly a quixotic case against the defendant.”

1. Skeptical; disbelieving. “Most people are incredulous of stories about flying saucers.” 2. Expressive of disbelief. “An incredulous stare.”

Extremely unpleasant; repulsive. Deserving of hatred or repugnance. “The detective said it was the most odious crime she had ever seen.”

Sharp or biting, as in character or expression. “The director occasionally allowed an acerbic tone to an otherwise subtle dialogue.”

1. Difficult to understand; abstruse. 2. Not publicly disclosed; confidential. 3. Of rare, special, or unusual interest. “Her software’s success was based on an esoteric programming language.”

Menacing; threatening. “Ominous black clouds;” “An ominousscream prior to the shooting.”

One that is out of its proper, chronological, or historical order, especially a person or practice that belongs to an earlier time. “A sword is an anachronism in modern warfare.”

 1. Lacking definition or definite content. 2. Lacking definite form or limits; vague. “The test results were nebulous and determined to be unusable.”

 To make more violent, bitter, or severe; to irritate or make worse. “The continued delays were greatly exacerbated by the lack of workers on the project.”

Relating to, or limited by time. Lasting only for a time; not eternal.  Also: fleeting, passing, momentary, temporary, transient, short-lived. “The beneficial effects of the loan were temporal.”