The present paper provides a systematic description of interjections in a moribund Eastern Kalahari Khoe language – Tjwao. After analysing original evidence within a prototype-driven approach, the authors conclude the following: (a) in Tjwao, the interjectional lexical class constitutes an internally diverse category confined between the canonical centre and a non-prototypical periphery; and (b) primary emotive interjections exhibit the highest degree of canonicity and extra-systematicity, while the canonicity and extra-systematicity of secondary phatic interjections is lowest.