2. Very great; — often adverbially. [Slang]

— Thun"der*ing*ly, adv.

Thun"der*ing, n. Thunder. Rev. iv. 5.

Thun"der*less, a. Without thunder or noise.

Thun"der*ous (?), a. [Written also thundrous.] 1. Producing thunder.

[R.]

How he before the thunderous throne doth lie.

Milton.