Antonyms of adj helmet-shaped

1 sense of helmet-shaped

Sense 1
helmet-shaped -- (having the convex shape of a helmet)

INDIRECT (VIA convex) -> concave -- (curving inward)

Similarity of adj helmet-shaped

1 sense of helmet-shaped

Sense 1
helmet-shaped -- (having the convex shape of a helmet)
       => convex (vs. concave), bulging -- (curving or bulging outward)