1. (

• ponderousness ,
• heaviness ,

) an oppressive quality that is laborious and solemn and lacks grace or fluency; "a book so serious that it sometimes subsided into ponderousness"; "his lectures tend to heaviness and repetition" ;

2. (

• heft ,
• heftiness ,
• massiveness ,
• ponderousness ,
• ponderosity

) the property of being large in mass ;