0
More fascinating ( comparative )
Most fascinating ( superlative )
most fascinating
Basically, it's a fascinating story.Basically, it's a fascinating story.Basically, it's a fascinating story.Basically, it's a fascinating story.
The first chapter was so fascinating that I had to finish the whole book right away.
Adjective forms for the verb "to fascinate" are the past participle "fascinated" and the present participle "fascinating".
"Fascinating" can also be a noun, and as an adjective fits the active sense better than "being" fascinated.