A sincerity condition is the psychological state of the speaker concerning the propositional content of an illocutionary act.

The sincere or insincere expression of this state necessarily accompanies all illocutionary acts, except for an act having a declarative illocutionary point , so that an act having

• an assertive point commits the speaker to having a state of belief
• a commissive point commits the speaker to having a state of intention
• a directive point commits the speaker to having a state of desire, and
• an expressive point commits the speaker to having an emotional, attitudinal, or sensory state.