If you do something consciously, you notice that you are doing it. You realise it; you are not on automatic. You might consciously slow your voice so you do not sound angry, or become consciously aware that everyone is looking at you. Learners often hear it as “on purpose,” and that is often close — though actually “on purpose” is a little stronger: you wanted that result. The core here is noticing, not plotting. People also say “consciously aware,” which repeats the same idea twice; it is common, if a bit padded. The word is ordinary English, not stiff. The look-alike you must not grab is conscientiously (doing your duty with care).