feebleminded

adj.

无决断力的；精神薄弱的；低能的；意志薄弱的

Studies in Animism: III. Animism in Feebleminded Subjects
Concept-switching in normal and feebleminded children as a function of reinforcement.
Social deprivation and rigidity in the performance of feebleminded children.
The effectiveness of social reinforcement with normal and feebleminded children
The effect of support and nonsupport on the performance of normal and feebleminded children.
Discrimination Learning and Discrimination Reversal Learning in Normal and Feebleminded Children
Rigidity, negative reaction tendencies, and cosatiation effects in normal and feebleminded children.
Eugenic Sterilization in California. II Social and Economic Status of the Sterilized Feebleminded.
Development of Tuberculosis and Changes in Sensitivity to Tuberculin in an Institution for the Feebleminded-A Ten Years' Study.
The effect of social reinforcement on the performance of institutionalized and nonistitutionalized normal and feebleminded children