言辞

Actions speak louder than words.

Try to word the letter in a friendly way.

speak convincingly

speak daggers

speak evasively; make an ambiguous speech; speak in equivocal terms

use high-sounding words

be sincere in what one says; speak earnestly

be prudent in utterance

speak with indignation; speak forcefully

speak daggers; use sharp words; make cutting remarks

make impertinent remarks; speak insolently

use arrogant language

speak by the card

be not good at expressing oneself; be clumsy in speaking