Upbeat means cheerfully positive and hopeful. An upbeat mood, an upbeat message, the tone was upbeat.
It is used of moods, music, reports and speeches, and it always describes the manner rather than the content — an upbeat assessment of bad figures is a real and common thing. The opposite is downbeat, which means subdued rather than negative. The word comes from music, where the upbeat is the beat before the first beat of a bar, and it has nothing to do with cheerfulness there at all — that sense grew entirely from the word looking like up.
1adjectiveupbeatCheerful and hopeful in tone.
“The report was surprisingly upbeat.”
synonyms: optimistic, positive, buoyant
2nounmusicIn music, the beat before the first beat of a bar.
“It starts on the upbeat, so come in early.”
upbeat is a cheerful tone.
Also accepted in games: optimistic
Middle English
beten
English
beat
English, today
upbeat
From up- + beat. beat comes from Middle English beten. Middle English beten, from Old English bēatan (“to beat, pound, strike, lash, dash, thrust, hurt, injure”), from Proto-West Germanic bautan, from Proto-Germanic bautaną (“to push, strike”). 2
Etymology from Wiktionary, CC BY-SA