The species is black in colour and its dorsal metathorax (metanotum) is almost perpendicular with the rear of its propodeum.

Megachile species have three maxillary palps, and male specimens have larger tarsi at the front.

[4] As a leaf-cutter bee, females of Megachile gentilis may cut sections of leaves in oval or circular shapes to line the cells of its nest.

Alternatively, they might use dried plant resin to line nest cells, which it carries in its mandible.

The species pollinates wild plants and crops and is a small or medium-sized bee.