aussichtslos
hopeless
Without any hope or chance of success; futile or pointless.
Trotz der aussichtslosen Lage kämpften die Retter unermüdlich weiter.
Despite the hopeless situation, the rescuers kept fighting tirelessly.

hopeless
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hopeless
Without any hope or chance of success; futile or pointless.
Trotz der aussichtslosen Lage kämpften die Retter unermüdlich weiter.
Despite the hopeless situation, the rescuers kept fighting tirelessly.

The word is made up of 'die Aussicht' (prospect/chance) and the ending '-los' (-less). Here, 'Aussicht' means 'chance' or 'prospect', and '-los' means 'without'. Literally, then, it means 'without a chance of success'.
Seine Bemühungen, das alte Auto zu reparieren, waren aussichtslos.
His efforts to repair the old car were hopeless.
'Aussichtslos' (hopeless) is often combined with nouns that describe an effort or situation. Common combinations are 'eine aussichtslose Lage' (a hopeless situation), 'ein aussichtsloser Kampf' (a hopeless fight), or 'ein aussichtsloses Unterfangen' (a hopeless undertaking).
Sie befanden sich in einer aussichtslosen Situation, mitten im Sturm auf dem Meer.
They found themselves in a hopeless situation, in the middle of a storm at sea.
As an adjective, 'aussichtslos' (hopeless) can either stand before a noun (attributive) or after a verb like 'sein' (to be) or 'scheinen' (to seem) (predicative). Before a noun, it must be declined.
Es war ein aussichtsloser Versuch, ihn zu überzeugen.
It was a hopeless attempt to convince him.
impossible
'unmöglich' and 'aussichtslos' can both describe that something will not succeed. 'unmöglich' means that something is not doable at all or cannot happen. 'aussichtslos' means that there is no realistic hope of success, even if one could theoretically try. Learners may confuse the words because both talk negatively about a chance. If something is fundamentally not possible, 'unmöglich' fits. If an attempt no longer has any hope, 'aussichtslos' fits.

Nach drei Gegentoren wirkte das Spiel für unsere Mannschaft fast aussichtslos.
After conceding three goals, the game seemed almost hopeless for our team.
Ohne Schlüssel ist es unmöglich, die Tür zu öffnen.
Without a key, it is impossible to open the door.