simmeringly

Adverb

simmeringly (comparative more simmeringly, superlative most simmeringly)

1. So as to simmer.
   • This meant that the quieter, more compliant African Caribbean child was perceived as subnormal or simmeringly hostile when the more competitive, garrulous behaviour which typified British children was taken as the normative standard.1999, Chris Chaloner, Michael Coffey, Forensic mental health nursing: current approaches, page 127