The given article dwells on the issues beset with the morphological features and the level of usage of the suffix -тарин/-tarin in the expression of the superlative degree of the Tajik adjective. The empirical basis for this research is Sadriddin Aini’s canonical novel “Ghulomon” (2019), a text that represents the benchmark of the modern Tajik literary language. The findings reveal that the suffix -тарин/-tarin demonstrates considerable productivity in Aini’s language, exhibiting specific patterns of formation and usage that reflect both traditional Persian morphological norms and the dynamic tendencies of the evolving Tajik literary language of the 20th century. The study highlights that the suffix -тарин/-tarin in the analyzed corpus fulfills not only its primary function of expressing the superlative degree but also develops additional semantic nuances, particularly in its substantivized forms. The research contributes to the understanding of the historical development of Tajik adjectival morphology and provides empirical data for comparative studies across different periods of the Tajik literary language.