Weak-minded a. : Having a weak mind, either naturally or by reason of disease; feebleminded; foolish; idiotic.

Example:
What does weak minded and weakling mean?

Taxonomy
weak-minded, Synonyms, Antonyms, Houghton Mifflin Company, judgment, conviction, intellect, Thesaurus, Translations, Unanswered questions, brainless, insensate, Português, 中文, Chinese, the American, American Heritage, Dictionary of the English Language.

Defination from the web:
weak-minded adj. Having or exhibiting a lack of judgment or conviction. Foolish; silly. Of less than normal intellect ... Having only a limited ability to learn and understand: backward, dull, simple, simple-minded, slow, slow-witted. Informal soft. ...