The term CUCUMBER SEA is composed of three words: IMPERTURBABLE (13 letters), GOURD (5 letters) and COOL (4 letters). The word IMPERTURBABLE means to be unshakable, unmoved or unperturbed. GOURD is a type of plant that produces a hard-shelled fruit, which can be used for decoration or as a container. Finally, COOL is an adjective used to describe something that is pleasant or refreshing. Together, these words form the phrase CUCUMBER SEA, which is used to describe a calm and peaceful atmosphere.