Answer:

nodsat

Answer	Crossword Clue
NODSAT	Greets silently
NODSAT	Acknowledges tacitly
NODSAT	Acknowledges, in a way

NODSAT	Greets wordlessly
NODSAT	Acknowledges wordlessly
NODSAT	Acknowledges wordlessly, in a way
NODSAT	Acknowledges with a head tilt
NODSAT	Signals, in a way
NODSAT	Signals, as to an auctioneer
NODSAT	Acknowledges in passing
NODSAT	Greets nonverbally

NODSAT	Signals
NODSAT	Acknowledges nonverbally
NODSAT	Gives a passing acknowledgment
NODSAT	Acknowledges without a sound
NODSAT	Gives a silent 'OK'
NODSAT	Greets, in a way
NODSAT	Greets without speaking