invisiblecause
nounUK /ɪnˈvɪzəbəl kɔːz/
US /ɪnˈvɪzəbəl kɔːz/
A cause is a reason something happens, so an invisible cause is a reason you cannot see.
The invisible cause of the funny smell was a sock under the bed.
OTHER MEANINGS
2. A reason that is hard to notice or understand.
The invisible cause of the team's win was everyone practicing quietly.
3. Something that makes a change happen without being seen.
Wind is an invisible cause that can move a kite.
4. A secret reason behind a surprising event.
The invisible cause of the missing cookies was a sneaky little brother.