expression, adverb
responsibly; properly; correctly
Used to describe doing something with a sense of responsibility, in a proper and correct manner. Often appears in formal or instructional contexts.
仕事は責任を持って最後までやり遂げます。
I will carry out the work responsibly to the end.
責任を持って行動してください。
Please act responsibly.
きちんと means 'properly' or 'neatly' in a general sense, while 責任を持って specifically implies acting with a sense of responsibility.
Phrase composed of 責任 (responsibility) + を (object marker) + 持って (te-form of 持つ, 'to hold'), literally 'holding responsibility'.