This study investigated and analyzed the use of rhetorical appeals, and the presence of hedges, and boosters in the argumentative essays of ESL learners. It is aimed at exploring the linguistic differences between male and female writers in terms of how they put forward their claims in an argument and how they appeal to their audience. The study found that male ESL learners prevalently use logical appeal in the development of their argumentative essays while the female learners use emotional appeal. On the other hand, the female learners use more hedging and boosting devices in their argumentative essays than male learners do. The results and findings of this study may contribute essential knowledge to linguists in constructing gender differences in the writing of argumentative essays in the context of ESL.