— thunderingly , adv.
/thun"deuhr ing/ , adj.
1. of, pertaining to, or accompanied by thunder.
2. producing a noise or effect like thunder.
3. very great; extraordinary: a thundering amount of work.
n.
4. thunder.
[ bef. 1100; ME thundring, OE thunring thunder. See THUNDER, -ING 2 , -ING 1 ]