Words to Describe eructation

How eructation often is described ("________ eructation")

• empty
• gaseous
• acid
• sudden
• simple
• hysterical
• much
• pious
• painful
• normal
• spasmodic
• loud
• nervous
• constant
• excessive
• noisy
• bitter
• free
• frequent
• occasional
• violent
• slight
• sour
• putrid
• odourless
• copious
• incomplete
• flatulent
• foul