Ridinculous 

Something that it a little less ridiculous than ridiculous. (Opposite to 'Redonkulous')

"That's just ridinculous"

Ridinculous by DoichyOfficial March 30, 2015

Ridicurous 

How DONNA CHENGstein mispronounced 'ridiculous' on the greatest sitcom ever, Seinfeld. It wasn't Elaine and you should be ashamed of yourself for thinking so.

Donna: This is really getting ridicurous!
Jerry: ..........Did you say 'ridicurous'?
Donna: Ridiculous!
jerry: I thought you said... 'ridicurous'...

Ridicurous by SoCrispy March 6, 2009

rediculous

The alarmingly common misspelling of ridiculous.

Joe: This game is rediculous!

Bob: Your spelling is ridiculous.

rediculous by Dassh July 25, 2004

ridonkulous 

Used when an event or action is way beyond "ridiculous". Extremely unbelievable.

Football Fan 1: Did you see that hit?
Football Fan 2: That shit was ridonkulous...

ridonkulous by m.a. santiago October 7, 2004

forking ridiculous 

The increasing number of cryptocurrency forks where an existing cryptocurrency code is splits in two resulting in a newer and older version.

Hey, did you hear that another bitcoin fork is coming? Yeah, it's getting forking ridiculous.

forking ridiculous by Uncle Buck, Tennessee June 2, 2018

ridonculous 

Functionally similar to the word "ridiculous," this word is often used in its place for extra emphasis.

There's a ridonculous amount of cheddar cheese stuck in the printer.

ridonculous by 755coop3 April 23, 2004

ridonculous 

(adjective) - ridiculous

Roald Dahl's BFG uses this word. This may be the origin of the word. First published in 1982.

Some of the other origins I've seen suggested are ridonculous.

ridonculous by doof0000 June 16, 2011