Perusteltuina

Perusteltuina is a Finnish linguistic form derived from the verb perustella, meaning to justify or to ground with reasons. The base adjective perusteltu means justified or grounded, and the form perusteltuina functions as a participial form used to describe something as being justified, on solid grounds, or supported by reasoning. It is most commonly found in formal or analytical writing, such as reports, policy documents, legal texts, and academic discussions, where authors want to indicate that claims, decisions, or interpretations are backed by evidence or argumentation.

In terms of grammar, perusteltuna/ perusteltuina appears as a participial form with the adverbial -na/-nä suffix, and it can serve as a predicative attribute or part of a larger clause. It is frequently used with nouns that denote statements, decisions, or arguments (for example, väite, päätös, argument), to express that these are regarded as justified.

Usage notes: The term carries a formal or evaluative tone, implying assessment or justification according to reasons or evidence. In everyday language, speakers might opt for more common constructions such as perustellusti (in a justified way) or phrases like perustelujen mukaan (according to the justifications). Finnish learners should note the close relationship between perustella (to justify), peruste (basis), and perustelu (justification). In English, perusteltuina can be translated as “well-grounded,” “justified,” or “on solid grounds.”