incommunicative
uncommunicative
blank
dull
inexpressible
unintelligent
biocompatible
cogitative
dirge-like
emotionless
expressionless
eyeless
incurious
inflectionless
lack-lustre
mean-looking
minor-key
over-respectful
owlish
sculpturesque
semiarid
sun-tanned
unanalysed
uncomprehended
uncomprehending
unfocused
unresponsive
unsuggestive