This is the 10871st most frequent Russian word.
вымышленный
Invented; fictional.
Here, 'вымышленный' is used as an adjective describing the fictional nature of the 'story'.
Его рассказ был вымышленным, но таким захватывающим.
His story was fictional, but so captivating.
In this sentence, 'вымышленный' characterizes a created or imagined 'character'.
Этот вымышленный персонаж был основан на реальном человеке.
This fictional character was based on a real person.
Here, 'вымышленный' denotes a 'story' that is invented or not factual.