absichtlich
deliberately
Intentionally, on purpose, and not by chance or by accident.
Er hat mich absichtlich angerempelt, um einen Streit anzufangen.
He deliberately bumped into me to start an argument.

deliberately
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deliberately
Intentionally, on purpose, and not by chance or by accident.
Er hat mich absichtlich angerempelt, um einen Streit anzufangen.
He deliberately bumped into me to start an argument.

The word 'absichtlich' (deliberately) is derived from the noun 'die Absicht' (intention). If you do something 'mit Absicht' (on purpose), you do it 'absichtlich' (deliberately).
Es war keine Absicht, ich habe dich nicht absichtlich ignoriert.
It wasn't intentional; I didn't deliberately ignore you.
As an adverb, 'absichtlich' (deliberately) can stand flexibly in the sentence, usually before or after the verb it describes. It can also be used alone as an answer or predicatively.
Sie hat die Tür absichtlich offen gelassen.
She deliberately left the door open.
'Absichtlich' (deliberately) is very often used to express that a negative action was intentional and not an accident. It emphasizes responsibility for an act.
Ich glaube, er hat das Glas absichtlich fallen lassen, weil er wütend war.
I think he deliberately dropped the glass because he was angry.
conscious / deliberate
'bewusst' and 'absichtlich' can both mean that something happens intentionally and not by chance. 'absichtlich' is very direct: someone wanted to do exactly that. 'bewusst' can be used in the same way, but it sometimes sounds a little less harsh and puts more emphasis on the fact that someone thought about it. In many everyday sentences, you can use both in a similar way. If you want to state clearly that something was not a mistake, 'absichtlich' is especially unambiguous.

Omar hat die Tür absichtlich leise geschlossen, weil das Kind schläft.
Omar deliberately closed the door quietly because the child is sleeping.
Jonas spricht bewusst langsam, damit alle ihn gut verstehen.
Jonas deliberately speaks slowly so that everyone can understand him well.