angelic
Very pure, kind, and good, like a perfect angel.
Angelic means resembling an angel in appearance or behavior, especially in being pure, innocent, or remarkably good. When a parent describes their sleeping toddler as looking angelic, they mean the child's peaceful face seems as sweet and innocent as the cherubs painted on church ceilings. When a teacher mentions a student's angelic behavior, she's noting how well-behaved and kind that student has been.
The word often describes someone who seems almost too good to be true. A child who helps elderly neighbors carry groceries, never complains about chores, and shares toys without being asked might be called angelic. But there's often a touch of exaggeration in the word: people sometimes use it ironically, like when a parent jokes about their mischievous kid's angelic smile right after discovering crayon marks on the wall.
Angelic can also describe sounds, particularly singing. An angelic choir has voices so pure and beautiful they seem heavenly. The word suggests something special and uplifting, like hearing music that gives you goosebumps.