Perusluonteiset
Perusluonteiset is a Finnish adjective form used to describe aspects that are considered fundamental or inherent to a person, a phenomenon, or a thing. It is commonly used to refer to stable, core characteristics or features that are not easily changed by external circumstances.
The word is built from perus-, meaning basic or fundamental, and luonteinen, meaning of character or nature.
In practice, perusluonteiset is most often encountered in discussions of personality, behavior, or the essential nature
Nuances include that the term is somewhat general and informal. It denotes what is fundamental without prescribing
See also: luonne, temperamentti, perusominaisuudet, perusominaisuuksiin liittyvä keskustelu.