For "expected":
* Unexpected: This is the most direct opposite, meaning something that was not anticipated.
* Unforeseen: Similar to unexpected, but emphasizing that the event was not predictable.
* Unplanned: Something that happened without prior arrangement.
* Accidental: Something that happened by chance, not intentionally.
* Spontaneous: Something that occurs impulsively and without planning.
For "deliberate":
* Accidental: Something that happened unintentionally.
* Unintentional: Similar to accidental, emphasizing the lack of intent.
* Careless: Something done without thought or attention.
* Random: Something that happens without any specific plan or purpose.
* Impulsive: Something done without careful consideration or planning.
The best word to use will depend on the specific situation and the nuance you want to convey.