An unusual object that is often old could be a curio.
The opposite of unusual is common.
weird
[object Object]
Unusual is a synonym for not ordinary.
[object Object]
funny
The opposite of unusual is common.
weird
That's an unusual question.
The word "colossal" is often used to describe things that are of unusual size or power.
unusual
strange.
Perhaps the word you are looking for is "normal".
The silent letter in the word "object" is the letter "j".
Unusual
fantasy?
amazing, unusual, awesome