An argument is an attempt to persuade someone of something. Reasons are given to accept the conclusion. The general structure of an argument in a natural language is that premises (propositions or statements) support the claim or conclusion.
An argument is a reason to support an opinion.
There can be a "strong argument" or a "convincing argument" (for example, a good reason for why something should be done). Argumentation is the process of conducting an argument.
The opposite is a "weak argument" or an "unconvincing argument". An argument can be valid or invalid or a combination of both. Some arguments may appear reasonable, but they turn out to be misleading or wrong.
Argument Facts for Kids. Kiddle Encyclopedia.