Сases of indefinite pronouns usage are considered, when the pronouns do not convey proper indefiniteness, but rather, to a greater or lesser extent, concretized indefiniteness. We propose to call such usage as conveyance of relative, or unidirectional indefiniteness. Cataphoric function of indefinite pronouns, the features of indefinite pronoun usage in “Isentences”, their combinations with proper names, adjectives, etc. were also examined.