
ungeschlagen
unbeaten
Not having been defeated in a competition, fight, or game.
Die Mannschaft ist in dieser Saison noch ungeschlagen.
The team is still unbeaten this season.
unbeaten / unbeatable
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unbeaten
Not having been defeated in a competition, fight, or game.
Die Mannschaft ist in dieser Saison noch ungeschlagen.
The team is still unbeaten this season.

unbeatable
Unsurpassed or better than anything else in a particular quality, such as price or quality.
Mit nur 50 Euro für das Zimmer ist dieses Hotel preislich ungeschlagen.
At only 50 euros for the room, this hotel is unbeatable in terms of price.
The word consists of the prefix 'un-' (negation) and 'geschlagen' (beaten), the past participle of 'schlagen' (to hit/beat). So it literally means 'not beaten' or 'undefeated.'
Der Boxer ist in seiner gesamten Karriere ungeschlagen.
The boxer is unbeaten in his entire career.
This meaning is used almost exclusively in the context of sports, games, or other competitions. Look for words like 'Mannschaft' (team), 'Spieler' (player), 'Saison' (season), or 'Turnier' (tournament).
Die Mannschaft blieb die ganze Saison über ungeschlagen.
The team remained unbeaten throughout the entire season.
In the meaning 'unbeatable' or 'unsurpassed,' the word is often specified more precisely by an adverb like 'preislich' (in terms of price) or a prepositional phrase like 'in puncto Qualität' (in terms of quality). It usually comes at the end of the sentence.
In Sachen Benutzerfreundlichkeit ist diese App ungeschlagen.
In terms of user-friendliness, this app is unbeatable.
unbeatable
Both words can refer to a team that has not been defeated. “Ungeschlagen” describes its record and states that it has not yet suffered a defeat, while “unschlagbar” expresses a current assessment of its strength. Use “ungeschlagen” for results and “unschlagbar” for an expectation or evaluation.

Nach fünf Spielen ist die Mannschaft noch ungeschlagen.
After five games, the team is still unbeaten.
Nach dieser starken Serie wirkt die Mannschaft für ihre Gegner unschlagbar.
After this strong winning streak, the team seems unbeatable to its opponents.