5th Grade Vocabulary Words - List 24

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Word Definition Practice Sentence Synonyms Antonyms Part of Speech Description
silly Showing a lack of judgment; foolish. He was talking in a silly voice all day. crazy, ridiculous, childish sensible Adjective
determine Come to a decision as a result of research. I was able to determine the origin of the noise. detect, ascertain, verify Verb
zealous Showing zeal. The zealous salesperson followed us around the store. enthusiastic, avid, passionate indifferent, apathetic Adjective
defiant Likely to challenge or resist. The defiant child kicked his feet and screamed. aggressive, challenging, insubordinate obedient Adjective
deeply To a profound degree; intensely. She is deeply committed to helping animals. completely, acutely, genuinely slightly Adverb
somewhere In or at a place. I was somewhere deep in the forest when I heard a growling noise. around, elsewhere, someplace nowhere Adverb
appointed Chosen for a job. We appointed her as the official navigator of the road trip. selected, chosen, delegated Adjective
lethal Relating to or capable of causing death. Never handle a venomous snake; its bite could be lethal. deadly, destructive, fatal harmless Adjective
pollution A substance or thing that is harmful or poisonous to the environment. Air pollution from wildfires has made the sunsets red and hazy all week. contamination, adulteration, dirtiness Noun
ziggurat An ancient Mesopotamian temple tower in the shape of a stepped pyramid. Archeologists discovered the remains of a ziggurat while excavating a site in Iraq. Noun

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