What is the Opposite to sociable?

The opposite of sociable depends on what aspect you want to emphasize:

For general lack of social interaction:

* Unsociable

* Introverted

* Reclusive

* Solitary

* Hermit-like

* Antisocial (though this has a more serious connotation)

For lack of friendliness:

* Unfriendly

* Cold

* Aloof

* Distant

* Reserved

For lack of ease in social situations:

* Awkward

* Shy

* Timid

* Uncomfortable

The best word to use depends on the specific context and what you want to convey.