negative regulation of endocardial cushion cell differentiation
Any process that stops, prevents, or reduces the frequency, rate or extent of endocardial cushion cell differentiation.
GO:0120074
regulation of endocardial cushion cell differentiation
is_a
GO:1905208
negative regulation of cardiocyte differentiation
is_a
GO:0061443
endocardial cushion cell differentiation
negatively_regulates