also: くちたっしゃ
na-adjective, noun
eloquent; glib; talkative; fluent
Describes a person who speaks smoothly and at length, often with a nuance of being a bit too smooth or talkative. Can be used positively or negatively depending on context.
彼は口達者で、どんな話題でも上手に話せる。
He is eloquent and can talk well on any topic.
口達者なセールスマンにうっかり契約させられた。
I was inadvertently talked into a contract by a glib salesman.
noun
smooth talker; glib talker
Used as a noun to refer to a person who is a smooth or glib talker. Often carries a slightly negative connotation of being too slick with words.
あの口達者には気をつけたほうがいい。
You'd better watch out for that smooth talker.
Compound of 口 (mouth) and 達者 (skillful, healthy). The reading だっしゃ is a euphonic change from たっしゃ.