Uncommon, rare.
antonym
common
common
uncommon, rare
Rare, uncommon
That would be "common".
steal is a common antonym for invent. possibly thief or copy-cat.
Obvious is probably the most accurate antonym for the most common usage of mysterious.
An antonym is the 'opposite' of a word. For example, the antonym for the word hot is cold. Scott is a common boy's name and names do not have 'opposites'.
common
ordinary, common,typical
common