From WordNet (r) 3.0 (2006):
rattling
adv 1: used as intensifiers; `real' is sometimes used informally
for `really'; `rattling' is informal; "she was very
gifted"; "he played very well"; "a really enjoyable
evening"; "I'm real sorry about it"; "a rattling good
yarn" [syn: very, really, real, rattling]
adj 1: extraordinarily good or great ; used especially as
intensifiers; "a fantastic trip to the Orient"; "the film
was fantastic!"; "a howling success"; "a marvelous
collection of rare books"; "had a rattling conversation
about politics"; "a tremendous achievement" [syn:
fantastic, grand, howling(a), marvelous,
marvellous, rattling(a), terrific, tremendous,
wonderful, wondrous]
2: quick and energetic; "a brisk walk in the park"; "a lively
gait"; "a merry chase"; "traveling at a rattling rate"; "a
snappy pace"; "a spanking breeze" [syn: alert, brisk,
lively, merry, rattling, snappy, spanking, zippy]
n 1: a rapid series of short loud sounds (as might be heard with
a stethoscope in some types of respiratory disorders); "the
death rattle" [syn: rattle, rattling, rale]