<p><strong>Adjective</strong></p><ul><li>quick to notice or perceive; alert: Watch for traffic and stay observant as you walk, not lost in thought.</li><li>Synonyms: perceptive</li><li>Antonyms: slow, dull</li><li>looking at, watching, or regarding attentively; watchful: Thousands of customers have been warned to be observant against a surge of scam letters claiming to be from the bank.</li><li>Synonyms: aware, mindful, heedful, attentive</li><li>Antonyms: heedless</li><li>actively following or adhering to a particular religion: In Holland during the year surveyed, there were more observant Muslims than either observant Catholics or Protestants, but not all Christians combined.</li><li>careful in following or adhering to a particular law, custom, religious ritual, or the like (often used with of or to): He is well-versed in Jewish law, and observant of its commandments.</li><li>Synonyms: obedient</li></ul><p><strong>Noun</strong></p><ul><li>a person who follows or adheres to a particular law, custom, religion, etc.: Observant.</li><li>Also Ob·ser·van·tine: a member of a Franciscan order that follows the strict rule of St. Francis.</li></ul>