Sidiq means honest and righteous; a person whose tongue in speaking is consistent with what is in his heart, and the one who has reached this position not only doesn’t lie to deceive himself but doesn't mislead others with his actions as well. Hazrat Mary is one of those people whose name has been mentioned in the holy Quran as Sidiq, "His mother was a truthful woman" (AL-MAEDA, verse 75)
source : erfan.ir