Weak mindedness is the state of being easily impressionable or possessing a weak sense of self-will, judgement or conviction.

A weak minded individual's opinion may be easily swayed by propaganda

Propaganda

Propaganda is a form of communication that is aimed at influencing the attitude of a community toward some cause or position so as to benefit oneself or one's group....

 or emotional manipulation

Psychological manipulation

Psychological manipulation is a type of social influence that aims to change the perception or behavior of others through underhanded, deceptive, or even abusive tactics. By advancing the interests of the manipulator, often at the other's expense, such methods could be considered exploitative,...

 tactics, as they do not possess an adequate ability to judge or discern the quality of an assertion, or they may exhibit a lack of discipline

Discipline

In its original sense, discipline is referred to systematic instruction given to disciples to train them as students in a craft or trade, or to follow a particular code of conduct or "order". Often, the phrase "to discipline" carries a negative connotation. This is because enforcement of order –...

.

Weak mindedness can result from several factors, including but not limited to lack of education

Education

Education in its broadest, general sense is the means through which the aims and habits of a group of people lives on from one generation to the next. Generally, it occurs through any experience that has a formative effect on the way one thinks, feels, or acts...

, lack of critical thinking

Critical thinking

Critical thinking is the process or method of thinking that questions assumptions. It is a way of deciding whether a claim is true, false, or sometimes true and sometimes false, or partly true and partly false. The origins of critical thinking can be traced in Western thought to the Socratic...

skills, lack of interpersonal experience or understanding, or developmental disability.