perusteelliset

Perusteelliset is Finnish an adjective form used to describe something that is thorough, comprehensive, or well-founded. It derives from perusteellinen, whose core meaning is grounded in a solid basis or basis of knowledge. The word is typically used to modify plural nouns, for example in expressions like perusteelliset tutkimukset (thorough studies) or perusteelliset tiedot (comprehensive information). In Finnish, adjectives agree with the nouns they modify in number and case, so perusteellinen becomes perusteelliset in the plural nominative.

Related forms include perusteellinen (singular, base form), perusteellisesti (adverb), and perusteellisuus (thoroughness). The term is common in formal and written Finnish, especially in academic, investigative, legal, and journalistic contexts where depth, rigor, and evidence-based grounding are emphasized. It signals that a subject has been examined in detail and that conclusions rest on careful analysis rather than superficial treatment.

Usage notes emphasize the positive sense of depth and methodical approach, though the strength of the modifier can vary with context. Perusteelliset analyses or explanations are typically viewed as reliable because they imply systematic procedures and robust evidence. The antonyms include perusteeton (baseless) or epätarkka (imprecise), which highlight the contrast between thorough and unfounded or incomplete treatment. While not a standalone concept, perusteelliset functions as a descriptive modifier that helps characterize the quality or scope of information, work, or evaluation.