grav·i·tas 
/ˈgrævəˌtɑ:s/ noun
/ˈgrævəˌtɑ:s/ noun formal : a very serious quality or manner [noncount] ▪ The new leader has an air of gravitas that commands respect. ▪ a comic actress who lacks the gravitas for dramatic roles [singular] ▪ The new leader has a certain gravitas.
