As a simple intensifier: very, extremely. Cf. marvellous, adv. Obsolete.

In a high degree, highly; more or better than average; supereminently, extraordinarily, supremely.

As an intensifier: remarkably, extremely. Frequently with good.

slang. Used intensively, as adj. or adv., like chopping, clipping, whacking, rattling, etc.

slang. Vigorous, ‘rattling’, ‘thumping’. Also as adv.