oblivious -
Not aware of or not concerned about what is happening around one
Alan was oblivious of the person talking to him because he was staring at his phone.
verb
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boggle -
For a person to be astonished or overwhelmed when trying to imagine something
Looking up at the stars and imagining the size of the universe can boggle a person's mind.
adjective
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dizzy -
Having a sensation of spinning around and losing one's balance.
After going on the giant roller coaster, Ed felt very dizzy.
adjective
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perplexing -
Confusing and difficult to understand
Scientists find it perplexing how life's incredible complexity came out Earth's hot water all by itself.
adjective
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vague -
Not clear
Joe got into the car to drive to the nearest mountain, even though he had only a vague idea of how to get there.
noun
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vertigo -
A feeling of being off-balance, dizzy, and spinning.
When grandma got off the merry-go-round, she had a bad case of vertigo and had to sit on a bench for a half hour.
adjective
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mystified -
Being very puzzled and confused
Edwin Hubble was mystified why the light analysis of certain stars showed a 'red shift', until he realized that they were entire galaxies moving away from us at tremendous speeds.
adjective
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woozy -
Unsteady, dizzy, or dazed
After the heated argument, Angela felt woozy, and had to slowly calm down.
adjective
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shellshocked -
Being confused and disorientd because of a sudden alarming and frightening experience.
When he found out that he had lost 90% of his money when the stock he had invested in had crashed, he was shellshocked.
adjective
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dazed -
Confused or unable to think clearly, often as a result of an injury or from shock
After her car accident, the dazed woman had to rest on the sidewalk.
adjective
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nebulous -
Unclear, vague, or ill-defined — lacking definite form or limits.
His explanation was so nebulous that no one really understood what he meant.
noun
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conundrum -
A confusing and difficult problem, situation, or question, where there is no clear or easy solution.
Figuring out how to balance work and personal life is a common conundrum.