Definition of cosmic for English Language Learners. : 1  of or relating to the universe or outer space. : 2  relating to spiritual matters. : 3  very large or important.
Definition of boast. 1 : a statement expressing excessive pride in oneself : the act or an instance of boasting (see 2boast) : brag It may sound like a boast, but I truly am very wealthy.
Synonyms: boast1, brag, crow2, vaunt. These verbs all mean to speak with pride, often excessive pride, about oneself or something related to oneself. Boast is the most general: We confide [that is, have confidence] in our strength, without boasting of it; we respect that of others, without fearing it (Thomas Jefferson).