1. An imperfect development.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• adennosis,
• ageness,
• agenssia,
• agenesisa,
• agenesa,
• agenessis,
• agnesis,
• egenesis,
• acenesis,
• agenis,
• eisegesus,
• ablenesss,
• agenesick,
• sagenesss,
• asecesis,
• Agnessi,
• amaxesis,
• lagnessis,
• phenesis,
• acenopsis

• agenize,
• agonus,
• agnosticism,
• agnise,
• Agnus Dei,
• agonised,
• Agnes,
• agnize,
• agnostical,
• Agnus,
• agonise,
• agenise,
• agnostic,
• agnosia,
• agonistic,
• agonist,
• agonistical,
• agenesia,
• agonize.

The adjective form of the word "agenesis" is "agenetic".

The plural of the "agenesis" can be the "ageneses".

The singular of the "agenesis" can be the "agenesis".