'Gruffly' definitions:

Definition of 'gruffly'

adverb

In a gruff manner; "`No,' he replied gruffly"

From: GCIDE

Gruff \Gruff\ (gr[u^]f), a. [Compar. Gruffer (gr[u^]f"[~e]r); superl. Gruffest.] [D. grof; akin to G. grob, OHG. gerob, grob, Dan. grov, Sw. grof, perh. akin to AS. rc['o]fan to break, Z. reavc, rupture, g- standing for the AS. prefix ge-, Goth. ga-.] Of a rough or stern manner, voice, or countenance; sour; surly; severe; harsh. --Addison. [1913 Webster]
Gruff, disagreeable, sarcastic remarks. --Thackeray. -- {Gruff"ly}, adv. -- {Gruff"ness}, n. [1913 Webster]