1. In a turgid manner
   "he lectured bombastically about his theories"
   - turgidly 
2. In a grandiose manner
   "the building was bombastically spacious"
   - grandiosely

See also: bombastic

• overall
• overambitious
• overanxiety
• overanxious
• overappraisal
• overarch
• overarm
• overawe
• overawed
• overbalance
• overbear
• overbearing
• overbearingly
• overbearingness
• overbid
• overbite
• overblown
• overboard
• overboil
• overbold
• overbook
• overbridge
• overbuild
• overburden
• overburdened