Before the Rain

the worthless word for the day is: Tonitruous

[fr. L tonitruare, to thunder] /tu NI tru ous/
thundering, fulminating (also tonitruant)

""Skill and kill, kill and skill, Carolina," muttered
Gattineau, -- words brushed aside by Simms's tonitruous
baritone as by a hand sweeping aside gnats."
- Craig Bell, Lost in the Elysian Fields, v. 3 (2002)

bonus word:
tonitruone - a device or instrument for imitating thunder
(so that's what that's called!)

...via WWFTD