What are the four common English words ending in "-dous"?
Isaac Asimov posed a puzzle in a magazine and I'm going crazy trying to figure out the answer. He said there are only four commonly used English words that end in -dous. Two are "positive" and two are "negative." The positive ones are tremendous and stupendous, and one of the negatives is horrendous. What is the fourth word?
The late Isaac may have thought there was only one other word, but around here we figure a man's reach should exceed his grasp. I'll give you two words — hazardous and timidous. What do you mean, timidous isn't common? Timid, timider, timidous. What could be commoner than that?
The last word
Re the four or five English words ending in -dous, did you forget "jeopardous"?
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.
All right already
Re the four or five English words ending in -dous, you forgot at least a dozen more, as the enclosed xerox from Walker's Rhyming Dictionary (1936) clearly indicates. The words are vanadous, molybdous, mucidous, multifidous, nefandous, frondous, decapodous, lagopodous, tylopodous, steganopodous, heteropodous, gasteropodous, isopodous, and ligniperdous.
… amphipodous, apodous, blizzardous, gastropodous, hybridous, iodous, nodous, octapodous, palladous, paludous, pudendous, rhodous, sauropodous, schizopodous, solipedous, splendidous, tetrapodous, voudous …
Very impressive, guys. But don't expect to get invited on any long fishing trips with me.