The best replacement for concave is convex.

The best alternatives to concave are rated as following:
★★★★★  convex
★★★★  convex lens
★★★  convex polygons
★  convex spine
★  convex function
★  convex shape
★  convex soft release
★  convex curve
★  convex curves
★  domed sticks
  convex magnifying glass
  convex polygon
  convex definition
  double concave
  concave
  convex geometry
  flat longboard

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concave
convex
convex lens