Active or passive voice?

[Inertia]

I am having a confused moment and tying myself in knots!

Is this sentence in the active or passive voice?

Claire was terrified.

On one hand, it's describing something Claire did , which was to be terrified.

On the other hand, it suggests that she was terrified by something.

I don't think it is either as there is only a Subject of the sentence (Claire) and no Object.

An illustration of passive/active voice would be:

Claire was terrified of the spider (active).

The spider terrified Claire (passive)

Terrified in that short phrase is more of an adjective than a verb, and is describing Claire's state, so I'd say active.

Active.

As explained by Thistledew.

Have a read of this:
www.ucl.ac.uk/internet-grammar/adjectiv/particip.htm

If the phrase was extended to "Claire was terrified by the enormous spider in the corner" then "terrified" would be verbal, not adjectival, and it would be passive voice

Thanks all. Yes, it makes sense to think of terrified as an adjective in that case.

The spider terrified Claire isn't passive!

Active for the spider, passive for Claire IMO.