In a decadent manner; with luxurious excess and abandon, often relating to decline or indulgence.
Possibly a variant or non-standard form related to 'decadent' + -ly. This may be a rare or specialized variant not in standard dictionaries.
Though rarely used in formal writing, 'decandently' appears in creative fiction to describe living with wild abandon—a word for those who want to sound more elaborate than 'indulgently.'
Complete word intelligence in one call. Free tier — 50 lookups/day.