pointless / senseless
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pointless
Without any recognizable meaning, purpose, or use. It describes actions or situations that are seen as unreasonable or futile.
Es ist sinnlos, bei diesem Regen ohne Schirm nach draußen zu gehen.
It's pointless to go outside in this rain without an umbrella.
The word is simply built: it consists of 'Sinn' (meaning/sense) and the suffix '-los' (without). So 'sinnlos' literally means 'without meaning/sense'.
Ein Streit über dieses Thema ist völlig sinnlos.
An argument about this topic is completely pointless.
'Sinnlos' (pointless) is very often used in the structure 'es ist sinnlos, etwas zu tun' (it is pointless to do something). This expresses that a particular action serves no purpose.
Es ist sinnlos, jetzt noch anzurufen, da das Büro schon geschlossen ist.
It's pointless to call now, since the office is already closed.
'Sinnlos' (pointless) often describes actions, discussions, or efforts. Typical combinations are 'sinnlose Gewalt' (senseless violence), 'eine sinnlose Debatte' (a pointless debate), or 'sinnlose Verschwendung' (pointless waste).
Wir sollten diese sinnlose Diskussion beenden und eine Lösung finden.
We should end this pointless discussion and find a solution.
The meaning 'bewusstlos' (unconscious) is outdated and is no longer used in modern language. You find it almost only in old literature.
In dem alten Roman fiel der verletzte Soldat sinnlos zu Boden.
In the old novel, the injured soldier fell unconscious to the ground.
sensible
'sinnvoll' and 'sinnlos' are clear opposites. 'sinnvoll' says that something has a purpose, benefit, or good reason. 'sinnlos' says that exactly this is missing, or that an action does not achieve anything. The difference is especially important with plans, tasks, or attempts: if something helps or leads to the goal, it is 'sinnvoll'; if it has no use or is futile, it is 'sinnlos'.
Es ist sinnlos, morgen zum Amt zu gehen, weil es geschlossen ist.
It is pointless to go to the government office tomorrow because it is closed.
Nach dem Gespräch war es sinnvoll, die wichtigsten Punkte aufzuschreiben.
After the conversation, it was sensible to write down the most important points.