Could you please tell me what part of speech this is?

It is an adjective.

Could you tell me the definition of the word?

It means “hanging by a thread”.

Could you please use it in a sentence?

I felt sew filipendulous it seamed I could knot fabricate a tail with a thread of truth needled to selvage myself.

Hahaha! That is sew punny!

That’s not.

You’re not.

Please, just spell the word.

Filipendulous —
F – I – L – I – P – E – N – D – U – L – O – U – S
Filipendulous —

Thank you.