This research is based on the study of two main problems: the concept of the unsaid in discourse, and the study of its functions that it performs. Therefore, it sought to achieve two main objectives: First: setting the concept of unsaid and presenting determinants that rid it of the rest of the forms of implicit meanings, and tracking how the speaker encodes it, then how the interlocutor decodes it. This is because the term unsaid still faces problems in defining its concept, and setting clear parameters that are free from the rest of the (what is implicated). This research depend on pragmatics approachs offers a more specific concept of the unsaid, by introducing a set of determinants that adjust the concept, by tracking the forms of the unsaid in the discourse. Finally it will clarify the mechanism by which the unsaid is generated, whether it is generated from grammatical structures such as omission and reference, or from rhetorical methods such as simile, metaphor, irony, pun, and others. Then it follows what was presented by the deliberative approaches in addressing the implicit meanings, especially the unsaid in terms of the steps that the speaker encodes the unsaid, and then the steps by which the interlocutor decodes the unsaid, and brings them to the speaker's intent. Second: After adjusting the point of view of the unsaid, it aims to build a model for the functions of the unsaid in discourse based on pragmatics principles. Beginning with the presentation of language functions at the level of declaration, by addressing models concerned with dividing and classifying language functions, such as Buhler's model, Jakobson's model, Orecchioni's model, and Halliday's model. Then benefit from these models, especially Jakobson's model, in building the unsaid functions model, based on the principle of deriving jobs from the basic factors that make up the communication process based on the unsaid. These factors are: the sender, the receiver, the secondary receivers, the unsaid meaning, the apparent literal meaning, the carrier template, and the social system. Seven functions of the unsaid were identified, in order: the preventive function, the argumentative function, the concealing function, the ambiguous function, the deceptive function, the poetic function, and the disciplinary function. Then test this model by applying it to the dialogues in Aleqd Alfareed book by Ibn Abd Rabbeh.