mindful

Etymology 1

From Middle English myndeful, myndefull, from Old English ġemyndful (“of good memory”), equivalent to mind + -ful.

adj

1. Being aware (of something); attentive, heedful.
   Alex McLeish, perhaps mindful of the flak he has been taking from sections of the Villa support for a perceived negative style of play, handed starts to wingers Charles N'Zogbia and Albrighton. December 10, 2011, Marc Higginson, “Bolton 1 - 2 Aston Villa”, in BBC Sport
2. (obsolete) Inclined (to do something).

Etymology 2

mind + -ful

noun

1. As much as can be held in one's mind at a time.
   A work of art may exceed a 'mindful' – whatever it is that can be accommodated within a mind at a given time – and may have to be regarded as a series of mindfuls. 1995, R. Tallis, Newton's Sleep: The Two Cultures and the Two Kingdoms
   So, whereas mouthfuls and servings are the units of fullness, mindfuls and savorings are the units of mind-fullness. 2008, Pavel G Somov, Eating the Moment
   A sketch can hold several mindfuls, allowing designers to see far more than they can imagine, allowing designers to integrate mindfuls. 2014, Toshiharu Taura, Principia Designae - Pre-Design, Design, and Post-Design