Definition of retardation
1: an act or instance of retarding
2: the extent to which something is retarded
3: a musical suspension
specifically : one that resolves upward
4a(1): an abnormal slowness of thought or action
psychomotor retardation
(2)now often offensive : INTELLECTUAL DISABILITY
b: slowness in development or progress
fetal growth retardation
Seems like an acceptable word to me. Just sayin'.
https://www.merriam-webster.com/dictionary/retardation
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