DEFERENTIALLY
deferentially
(adverb) in a respectfully deferential manner; “he listened deferentially”
deferentially, submissively
(adverb) in a servile manner; “he always acts so deferentially around his supervisor”
Source: WordNet® 3.1
Etymology
Adverb
deferentially (comparative more deferentially, superlative most deferentially)
In a deferential manner.
Source: Wiktionary
Def`er*en"tial*ly, adv.
Definition: With deference.
DEFERENTIAL
Def`er*en"tial, a. Etym: [See Deference.]
Definition: Expressing deference; accustomed to defer.
Source: Webster’s Unabridged Dictionary 1913 Edition