closing
The opposite of opening would be closing or shutting.
The short vowel opposite of "opening" is "closing".
THE opposite of perform is direct
There is no direct opposite.
The opposite of not opening is opening. Eight-letter synonyms for opening, depending on context, include clearing, unlacing, exposing, starting
The opposite is a direct relationship.
opposite word of reporting
direct
Direct.
Opening
direct
The direct opposite of adjacent is nonadjacent (or non-adjoining). But for geometry or location, the usual opposite is "opposite" meaning "across from."