http://www.straightdope.com/columns/read/744/what-are-the-four-common-english-words-ending-in-dous
A lot of those towards the end there are uncommon, obviously. I’ve gone all these years without needing them and probably will die without ever having done so.
A correction. This part of the column should not be italicized:
*Dear Cecil:
No. To forget something you have to have heard of it in the first place, which frankly I hadn’t, mainly because the last cited use of jeapardous in the Oxford English Dictionary was in 1661. (“Yo, varlet, is the new quiz show ‘What’s My Linish’ or ‘Wheel of Fortunesque’?” “Neither, milord, it is ‘Jeopardous.’”) So sue me.*
And the salutation should be “Dear M.H.,” since it’s clearly Cecil’s response to the message just above it.
Thanks.