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Adjective: congratulatory  kun'gra-chu-lu,to-ree [N. Amer], kun,gra-tyû'ley-tu-ree or kun'gra-chu-lu-tree [Brit]
  1. Expressive of sympathetic pleasure or joy on account of someone's success or good fortune
    "a congratulatory telegram"; "the usual congratulatory crowd was conspicuously absent";
    - gratulatory

See also: felicitous