Definition of growlingly in US English:

growlingly

adverb

  • See growl

    • ‘He was appointed justice commissioner by the incoming president of the commission and another representative of the growlingly macho, if sexually somewhat ambivalent, south of Europe.’
    • ‘It delivers fully on the band's potential, a cocky, growlingly back-handed blow at the record business that had just given him and his buddies a nice contract the year before.’