grueling; characterized by effort to the point of exhaustion; especially physical effort
The laborious climb up the mountain took nearly twelve hours.
Vocabulary like laborious appears on the Digital SAT in Words-in-Context questions, where you choose the word that fits a passage's meaning and tone. You can also drill this word with vocabulary flashcards.
endanger; pose a threat to; present a danger to
joking; characterized by jokes and good humor
showing good judgment
reason; something that shows an action to be reasonable or necessary
support; show to be reasonable or provide adequate ground for
place side by side
excite; catch fire
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