笃定

笃定	dǔ dìng	certain / confident (of some outcome) / calm and unhurried
笃	dǔ	serious (illness) / sincere / true
定	dìng	to fix; to set; to make definite / to subscribe to (a newspaper etc); to book (tickets etc); to order (goods etc) / to congeal; to coagulate / (literary) definitely