Few studies to date examined the emotional unrest that results from communication across cultures in multinational teams (MNTs). Through examination of 12 in-depth interviews and a focus group of respondents from MNTs, this study investigates the impact of language-induced emotions in MNTs resulting from a corporate language mandate. Even with highly proficient linguists, MNTs still experience collaborative difficulties caused by language differences and associated emotions. Issues identified include loss of information, ambiguity over equivalence of meaning, variability in sociolinguistic competence, and problems of adjustment to cultural norms. The research also pinpointed several lingua-culturally adaptive behavioral strategies relating to international leadership.