JAMB - English Language (1990 - No. 10)
In the question below choose the option opposite in meaning to the word Underlined:The difference between the experimental procedure was imperceptible to me
negligible
significant
obvious
obscure
Тайлбар
"Imperceptible" means something very difficult or impossible to perceive, detect, or notice. The opposite of this would be "obvious".This means that the difference was noticeable and easily understood.