Definitions for taciturnly
Random House Webster's College Dictionary
inclined to silence; reserved in speech; uncommunicative.
dour, stern, and silent in expression and manner.
Origin of taciturn:
1765–75; < L taciturnus=tacit(us) silent (see tacit ) +-urnus adj. suffix of time
mutely, wordlessly, silently, taciturnly(adverb)
"he sat mutely next to her"
quietly; not in a manner inclined to speaking.