Meaning of 堅言葉 in Japanese

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Definition of 堅言葉

ことば(kotoba) · けとば(ketoba) 【言葉 ·詞 ·辞】

(n) language; dialect
「言葉の一面は、伝達しようとする意志である」と彼は言う。
"One aspect of language is an intent to communicate," he says.
word; words; phrase; term; expression; remark
言葉が出てこなかった。
Words failed me.
speech; (manner of) speaking
こういった言葉使いは彼の人格に合わない。
Such language doesn't harmonize with his character.

けん(ken) 【堅】