Synonyms:
* Doubtful: This suggests a lack of certainty or belief.
* Distrustful: This emphasizes a lack of trust.
* Skeptical: This implies a questioning attitude and a need for evidence.
* Wary: This means being cautious and alert to potential danger.
* Questioning: This suggests a desire to investigate further.
* Guarded: This suggests a reluctance to trust or be open.
* Misgiving: This is a feeling of doubt or apprehension.
Antonyms:
* Trusting: This suggests a willingness to believe without question.
* Confident: This indicates a strong belief or certainty.
* Assured: This implies a feeling of safety and security.
* Faithful: This suggests unwavering belief or loyalty.
* Certain: This means having no doubt.
* Unsuspecting: This indicates a lack of awareness of potential danger or deception.
The best synonym or antonym to use will depend on the specific context in which you are using the word "suspicious."