This chapter offers an in-depth analysis of verbs in the Thai language, focusing on their classification, functions, and syntactic behavior. Unlike Indo-European languages, Thai verbs remain uninflected, shifting the grammatical load to auxiliary markers and contextual cues. The chapter begins by categorizing verbs into transitive, intransitive, ditransitive, auxiliary, stative, and modal forms, with detailed explanations and authentic examples illustrating each type. A particular emphasis is placed on verb behavior in relation to aspect, modality, voice, and directionality. Subsections address how verbs interact with classifiers, how they form complex verb chains, and how they are influenced by emotive and completive structures. Furthermore, the chapter highlights verb-assisted words and their role in marking temporal, aspectual, and modal nuances, providing a comprehensive framework for understanding Thai verb constructions. By bridging traditional Thai grammatical theories with contemporary linguistic approaches, this chapter equips readers with a functional and nuanced understanding of verb usage in Thai, essential for both language learners and linguistic researchers.