Stóllinn er óþægilegur.

to be

Breakdown of Stóllinn er óþægilegur.

• stóllinn: the chair
• óþægilegur: uncomfortable

Questions & Answers about Stóllinn er óþægilegur.

Why does stóll have -inn at the end (stóllinn)?

In Icelandic the definite article is usually a suffix attached to the noun.

• stóll = an (indefinite) chair
• stóll-inn = the chair
  For a masculine noun in the nominative singular, the definite ending is commonly -inn (with some spelling adjustments depending on the noun).

How do I know stóllinn is the subject here, and what case is it in?

The subject of a normal “X is Y” sentence is in the nominative. Here, stóllinn is doing the “being,” so it’s nominative singular. Predicative adjectives (like óþægilegur) agree with that nominative subject.

Why is the verb er used, and what verb is it?

er is the present tense, 3rd person singular form of vera (to be).
You use it like English is: Stóllinn er … = “The chair is …”

Why is it er and not eru?

Because stóllinn is singular.

• er = is (3rd singular)
• eru = are (3rd plural)So with a plural subject you’d get (“The chairs are …”).