The Collaborative International Dictionary
Thunderless
Thunderless \Thun"der*less\, a. Without thunder or noise.
Wiktionary
thunderless
a. Without thunder.
Usage examples of "thunderless".
It seemed neither cloud nor water awake, And forth of the low black curtain slipped Thunderless lightning.
Then came there that flash which is recorded in old traditions as the fourth of the flashes of thunderless lightnings, after the passing of which, hundreds of fakirs that had been awaiting it saw nothing further on this earth.
Far away to the west over the black mountains of the mainland I saw the nervous, thunderless flicker of summer lightning.