ex ‧ pres ‧ sion ‧ less /ɪkˈspreʃ ə nləs/ BrE AmE adjective
[ Word Family: adverb : ↑ expressively , ↑ expressionlessly , ↑ inexpressibly ; adjective : ↑ expressive ≠ ↑ inexpressive , ↑ expressionless , ↑ inexpressible ; noun : ↑ expression , ↑ expressiveness ; verb : ↑ express ]
an expressionless face or voice does not show what someone thinks or feels OPP expressive :
a blank expressionless stare
—expressionlessly adverb