Antonyms of adj gnarly

1 sense of gnarly

Sense 1
gnarled, gnarly, knotted, knotty, knobbed -- (used of old persons or old trees; covered with knobs or knots; "gnarled and knotted hands"; "a knobbed stick")

INDIRECT (VIA crooked) -> straight -- (having no deviations; "straight lines"; "straight roads across the desert"; "straight teeth"; "straight shoulders")

Similarity of adj gnarly

1 sense of gnarly

Sense 1
gnarled, gnarly, knotted, knotty, knobbed -- (used of old persons or old trees; covered with knobs or knots; "gnarled and knotted hands"; "a knobbed stick")
       => crooked (vs. straight) -- (having or marked by bends or angles; not straight or aligned; "crooked country roads"; "crooked teeth")