1. graded adjective & adjective [usu ADJ n] If you say that someone has a riotous lifestyle, you mean that they frequently behave in a excessive and uncontrolled way, for example by eating or drinking too much. [formal] ⇒ ...aristocrats who wasted their inheritances in riotous living. 2. graded adjective & adjective [usu ADJ n] You can describe someone's behaviour or an event as riotous when it is noisy and lively in a rather wild way. ⇒ The dinner was often a riotous affair enlivened by superbly witty speeches. ⇒ ...a riotous exhibition of boogie-woogie piano playing. riotously
adverb [ADV adj/-ed] ⇒ ...a slapstick affair which I found riotously amusing. 3. adjective [ADJ n] You can describe things as riotous when they are very colourful or decorative rather than plain or simple. ⇒ ...a riotous collection of gaudy and glamorous dresses.
COBUILD Advanced English Dictionary. Copyright © Harper Collins Publishers