This book explains the emotion concepts of the Ibans, one of the indigenous peoples in Sarawak, Malaysia. It is an outcome of a research study, which aims to analyse the Iban emotion concepts utilizing Natural Semantic Metalanguage (NSM), an analytical tool developed by Anna Wierzbicka (1991), and the concrete/abstract cultural continuum framework, a framework introduced by J. Vin D'Cruz and G. Tham (1993), and later, J. Vin D'Cruz and William Steele (2000). NSM enables emotion terminologies in Iban to be explicated and further defined along the concrete/abstract cultural continuum framework. The respondents of this study were the village community of Sbangki Panjai, a longhouse located in Lubok Antu, Sarawak. The findings reveal the core cultural values that underlie the people's behaviours in the ways they express their emotions. The complex 'rules of logic' called "adat" and the rules of speaking in this speech community are discussed in detail in this book, which explain the Ibans' communicative behaviours. Although the semantic analysis of the emotion words is exhaustive and comprehensive, it is necessary in order to reveal the complete meaning of the emotions being examined without creating ethnocentric bias. Thus, this book essentially describes how the Ibans relate themselves to others in their interaction.