The best replacement for convex is concave.

The best alternatives to convex are rated as following:
★★★★★  concave
★★★  concave lens
★★  concave polygons
★★  flat mirror
★★  flat rear view mirror
★  flat tamper
★  converging lens
★  concave curve
★  concave functions
★  converging
★  concave curves
★  scandi
★  concave lenses
★  concave bagua mirror
★  concave shape
  v edge
  non convex
  hollow grind
  concave mirror
  concave spine
  concave diagram
  flat mirrors
  concave definition
  flat grind
  concave second derivative
  concave surfaces
  concave glasses
  concave up
  concave graph

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Google Trends

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convex
concave
concave lens