Implausible (adjective) — غير مُقنع: Not seeming reasonable or likely. Below are 8 words with a similar meaning; the linked ones have full GL Dictionary entries with their meaning in Arabic.
Not likely to happen or be true.
Not likely to happen or be true.
Hard to believe; extraordinary.
feeling or showing uncertainty, skepticism, or lack of confidence about something; unlikely to occur or be true; questionable in terms of quality, validity, or…
Hesitating or doubting; not to be relied upon; suspect; questionable in terms of quality, validity, or authenticity.
Hard to believe; amazing.
far-fetchedunconvincing
Impossible to imagine or believe.