fe'-b'-l-min'-ded (oligopsuchos):

Only in 1 Thessalonians 5:14 the King James Version, in the sense of "fainthearted," as in the Revised Version (British and American). In Septuagint it is used as the equivalent of koshel, the tottering or feeble-kneed in Isaiah 35:3; 54:6; oligopsuchia occurs in Septuagint twice (Exodus 6:9; Psalms 54:7), for "anguish of spirit" and "trouble." The term refers to weakness of will and vacillation of purpose rather than to idiocy or morbid imbecility.

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Bibliography Information
Orr, James, M.A., D.D. General Editor. "Entry for 'FEEBLE-MINDED'". "International Standard Bible Encyclopedia". 1915.