Terse means short and abrupt in what is said. Fewer words than politeness would use.
It describes replies, statements and notes, and a terse reply is one that closes a conversation. There is a genuine ambiguity in it, since terse can be praise for economical writing and criticism for a rude answer, and only the context decides. It sits close to curt, which is always rude, and succinct, which is always a compliment. The adverb tersely usually appears in dialogue tags.
1adjectiveterseUsing very few words, in a way that seems abrupt.
“The statement was terse and gave no reasons.”
Proto-Indo-European
*terh₁-
Latin
tersus — clean, cleansed, rubbed or wiped off; neat, spruce; terse
English, today
terse
From Latin tersus (“clean, cleansed, rubbed or wiped off; neat, spruce; terse”), perfect passive participle of Latin tergō (“to clean, cleanse, rub, wipe, wipe off”).
Etymology from Wiktionary, CC BY-SA