SYN: Grave, thoughtful, careful, earnest, solemn, important, weighty.
ANT: Volatile, gay, thoughtless, careless, joking, jocose, insignificant, unimportant, trifling, trivial, light.
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KEY: Serpentine.
SYN: Winding, meandering, tortuous, anfractuous, undulating, sinuous, anguilliform, vermicular, coiled.
ANT: Straight, unbending, unwinding, rectilinear.
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KEY: Servant.
SYN: Retainer, domestic, attendant, minister, maid, abigail, handmaid.
ANT: Lord, master, mistress, employer.