Senile paranoid dementia is a type of dementia that is characterized by delusions, Hallucinations, and an increased sense of suspicion or fear. The antonyms for senile paranoid dementia would be a state of mental clarity, rationality, and emotional stability. The opposite of paranoia would be a sense of comfort, safety, and trust in one's surroundings. The opposite of senility would be youthfulness, vitality, and an unimpaired mental state. The antonyms for dementia would be cognition or mental acuity, memory retention, and a clear thought process. In short, the antonyms for senile paranoid dementia would be mental clarity, emotional stability, trust, and cognition.