fullorðinn

Fullorðinn is an Icelandic adjective meaning "adult" or "fully grown." It is used to describe a person who has reached the age of majority and is no longer a minor. The term can also be used in broader sense to refer to beings or things that are fully developed, though it is most common in reference to people.

In Icelandic, adjectives decline to agree with the gender, number, and case of the noun they modify. The masculine singular nominative form is fullorðinn, as in fullorðinn maður (an adult man). The feminine singular nominative form is fullorðin (as in fullorðin kona), and the neuter singular nominative form is fullorðið (as in fullorðið barn). Plural forms follow standard declension: fullorðnir menn (adult men), fullorðnar konur (adult women), fullorðin börn (adult children).

The concept is widely used in legal, educational, medical, and social contexts to distinguish adults from minors. In everyday language, fullorðinn is often employed in statements about responsibility, rights, or eligibility that apply to people who have reached the age of maturity. Phrases such as "þeir sem eru fullorðnir" (those who are adults) or "fullorðinn einstaklingur" (an adult individual) are common.

Overall, fullorðinn functions as the standard Icelandic term for describing adult status and mature development, with grammatical forms adapting to gender and number as required.