One antonym for probably is unlikely.
An antonym for aisle is classroom
improbably.
Yes. Up is the antonym of down. Left is the antonym of right.
Probably collinear.
There is no strict antonym of 'Equator'. You are probably thinking of the North and South Poles.
Since aura is a noun, there really isn't an antonym for it. The closest thing to an antonym for it, however, would probably be foreground.
That would probably be... student.
Probably speaker
probably a plain.
Obvious is probably the most accurate antonym for the most common usage of mysterious.
since "stationary" means standing still, then the antonym would probably be "moving"
Obvious is probably the most accurate antonym for the most common usage of mysterious.