I am anxious

Tha mi iomagaineach

We can use  ainmearan  (nouns), such as  iomagain  (anxiety), with the preposition  air  to talk about how we feel:

Tha iomagain orm.
I am anxious [lit. anxiety is on me].
Tha teagamh air Niall.
Neil is doubtful [lit. doubt is on Niall].
A bheil fearg ort?
Are you angry [lit. is anger on you]?
Tha bròn air Màiri.
Màiri is sad/sorrowful [lit. sorrow is on Màiri]

We could also use  buadhairean  (adjectives) to do this:

Tha mi iomagaineach.
I am anxious.
A bheil Niall teagmhach?
Is Niall suspicious?
Tha mi feargach.
I am angry.
Chan eil Màiri brònach.
Màiri isn't sad.

Nouns expressing feelings are typically used with the preposition  air , and sometimes with both  aig  and  air :

A bheil teagamh orra?
Are they uncertain?
Bha gràin aice air a' bhùth sin!
She hated that shop!

Adjectives can be used with the verb  bi :

Nach eil iad teagmhach?
Aren't they doubtful?
Cha robh sinn iomagaineach idir!
We weren't anxious at all!
AINMEARANBUADHAIREAN
bròn (m)sadnessbrònach (adj)sad
teagamh (m)doubt, uncertaintyteag(a)mhach (adj)doubtful
iomagain (f)anxiety, concerniomagaineach (adj)anxious
fearg (f)angerfeargach (adj)angry
nàire (f)embarrassment, shamenàireach (adj)embarrassed
àgh (m)joy, happinessàghmhor (adj)happy, joyful