Antonyms of adj sinuous

1 sense of sinuous

Sense 1
sinuate, sinuous, wiggly -- (curved or curving in and out; "wiggly lines")

INDIRECT (VIA curved) -> straight -- (free from curves or angles; "a straight line")

Similarity of adj sinuous

1 sense of sinuous

Sense 1
sinuate, sinuous, wiggly -- (curved or curving in and out; "wiggly lines")
       => curved (vs. straight), curving -- (having or marked by a curve or smoothly rounded bend; "the curved tusks of a walrus"; "his curved lips suggested a smile but his eyes were hard")