JAMB - English Language (2001 - No. 35)
Choose the option opposite in meaning to the underlined word(s).
It is inconceivable that the rat devoured the cat.
contestable
incomprehensible
credible
unimaginable
Paskaidrojums
The word "inconceivable" means something impossible to imagine or believe. Therefore, the opposite would be something believable or credible.