What word is opposite of sassy?

There isn't one single perfect opposite for "sassy." It depends on the specific context and what aspect of "sassy" you want to contrast. Here are some possibilities:

General opposites:

* Submissive: This implies a lack of confidence and assertiveness.

* Timid: This describes someone who is shy and easily intimidated.

* Unassertive: This means lacking in self-confidence and not expressing one's opinions or needs.

* Bland: This describes someone who lacks personality and is uninteresting.

Opposites based on specific aspects of "sassy":

* Polite: If "sassy" implies being rude or disrespectful, "polite" is the opposite.

* Formal: If "sassy" implies being informal or casual, "formal" is the opposite.

* Humble: If "sassy" implies being arrogant or conceited, "humble" is the opposite.

* Calm: If "sassy" implies being fiery or aggressive, "calm" is the opposite.

The best word to use will depend on the specific situation.