wordless (adj.)

• aphasic
• aphonic
• breathless
• brief
• brusque
• close
• closemouthed
• concise
• curt
• dumb
• dumbfounded
• dumbstricken
• dumbstruck
• implicit
• inarticulate
• laconic
• mum
• mute
• quiet
• reserved
• reticent
• short
• silent
• snug
• speechless
• tacit
• taciturn
• terse
• tongue-tied
• tongueless
• uncommunicative
• undeclared
• understood
• unexpressed
• unpublished
• unrecorded
• unsaid
• unspoken
• unsung
• untalkative
• untold
• unuttered
• unvoiced
• unwritten
• voiceless