Learn Icelandic: Enginn kjósandi er sammála.

Enginn means no or none. Unlike the plural quantifiers in this lesson (like fáir for few or margir for many), enginn is used here in the singular because kjósandi (voter) is a singular masculine noun. To say few voters agree, you would switch to the plural: Fáir kjósendur eru sammála.

Kjósandi looks a bit like a verb. How does this noun work?

Kjósandi means voter. It comes from the present participle (the -ing form) of the verb kjósa (to vote). Icelandic often uses these action forms as masculine nouns to describe a person doing the action, similar to the word nemandi (student).

Why doesn't the adjective sammála have a masculine ending to match kjósandi?

Sammála (agreeing) is a special type of adjective that never changes its form. No matter if you are talking about a masculine noun, a feminine noun, or multiple people, the word will always stay exactly as sammála.

The English translation says agrees, but the Icelandic sentence uses er (is). Why?

In Icelandic, agreeing isn't an action verb like it is in English. Instead, you use the verb vera (to be) along with the adjective sammála. So the sentence literally means: No voter is agreeing.