Staid+10

Staid-(adj) showing or having the characteristics of being proper, serious or solemn.

Line from Book( page 44) :"... this party had preserved a dignified homogeneity, and assumed to itself the function of representing the staid nobility of the country-side-East Egg condescending to West Egg, and carefully on guard against its spectroscopic gayety."

My Sentence: He had a reputation of being very **//staid//**.