disposed to be silent or not to speak freely; reserved.

reluctant or restrained.

adjective

communicative , forward , unrestrained

adjective

bashful , clammed up , close , close-mouthed , dried up , dummied up , hesitant , mum , reserved , restrained , shy , silent , taciturn , tight-lipped , uncommunicative , unforthcoming , unspeaking , uptight * , incommunicable , incommunicative , tightlipped , uncommunicable , aloof , chill , chilly , distant , offish , remote , solitary , standoffish , unapproachable , undemonstrative , withdrawn , discreet , dumb , laconic , quiet , reluctant , retiring , secret , secretive , speechless , subdued , unwilling