What are some of the biggest barriers to communication?

There are many barriers to communication. Some are main hardles e.g, planing what thing I want to express? what thing the other party want to express? Its a psycological thing. The other things in barriers are the sources for communications. 

• The use of jargon. Over-complicated, unfamiliar and/or technical terms.
• Emotional barriers and taboos. Some people may find it difficult to express their emotions and some topics may be completely 'off-limits' or taboo. Taboo or difficult topics may include, but are not limited to, politics, religion, disabilities (mental and physical), sexuality and sex, racism and any opinion that may be seen as unpopular.

Differences in perception and viewpoint.Language differences and the difficulty in understanding unfamiliar accents.

The first and most important barrier is non existence of proactive listening!

There are different types of Barriers. There are physical barriers, mental barriers, language barriers and so on

1) Not knowing your audience. 

2) Lack of attention, interest, distractions, or irrelevance to the receiver. ...

3) Differences in perception and viewpoint.

4) Physical disabilities such as hearing problems or speech difficulties.

5) Language differences and the difficulty in understanding unfamiliar accents.

6) Cultural differences

The biggest barrier is the noise, and second one is not listen to your audience rather one way message sending, third one never try to put your foot into audience shoe, and absence or lack of frequently message sending, feedback receiving and feedforward mechanisms in time and remours minimization, and choose of right communication mediums for effective communication. 

There are many barriers, including language, introversion, intellectual differences, lack of development and self-learning

there are many of biggest barriers in communication like laungage,cultural divesity,physical separation and emotion play big rule in communication as some of people being shy, confident,..etc

There are many barriers to communication among which language difference, understanding others viewpoints, and lack of information.

I believe it is a lack of self-confidence and thinking about what other people think.

The biggest barriers to communication exist in any organization, but some are more pervasive and more common than others. Barriers can be environmental or personal and may include such things as noise (real or internal), bias, cultural differences or even differences in roles, or levels of authority, within the organization.