Grade

12th grade vocabulary words

A suggested collection for 12th grade practice. Read the meanings, try the examples, and use each word in a sentence of your own.

Word	Meaning	In a sentence
ameliorateverb	To make a harmful or difficult situation better.	The extra bus service should ameliorate crowding during the morning rush.
ambiguousadjective	Open to more than one reasonable interpretation.	The ambiguous instruction left us unsure which door to use.
ephemeraladjective	Lasting for only a short time.	The ephemeral rainbow faded before I could find my camera.
impetuousadjective	Acting quickly on a strong feeling without thinking through the result.	In an impetuous moment, Leo volunteered to lead the event before checking his schedule.
justifyverb	To give reasons or evidence showing that a choice, claim, or action is reasonable.	Justify your answer with a calculation.
mitigateverb	To make a harmful effect, problem, or risk less severe.	Planting trees can help mitigate heat in a paved courtyard.
scrutinizeverb	To examine something very closely and carefully.	The editor scrutinized the figures before publication.
tenuousadjective	Weak, uncertain, or supported by very little evidence.	The claim rests on a tenuous link between two unrelated events.
thesisnoun	The central claim that a piece of writing develops and supports.	The essay's thesis is that the city needs more shaded public spaces.
vindicateverb	To show that someone or something was right, justified, or unfairly blamed.	The recovered records vindicated the employee who reported the error.