Talsverður
Talsverður is an Icelandic word that translates to considerable, significant, or substantial in English. It is an adjective used to describe something of a noteworthy amount, degree, or importance. The word can be applied to a wide range of contexts, indicating a magnitude that is not negligible.
For example, one might say that a person has made "talsverður framlag" which means a considerable contribution.
In terms of grammatical usage, "talsverður" is an adjective and thus agrees in gender, number, and case