courteous act (noun) act of courtesy: polite act
Sinonime: candid, chatty, communicable, conversable, conversational, demonstrative,
effusive,
enlightening, expansive,
forthcoming,
frank,
garrulous, gushing,
loquacious,
open,
outgoing, talkative, unreserved, voluble
Antonime: close-mouthed,
reserved,
reticent,
unfriendly, uninformative, unsociable