Adjectives

(a)attentive(often followed by ‘to’) giving care or attention“attentive to details”, “the nurse was attentive to her patient”, “an attentive suitor”
(a)heedful, attentive, thoughtful, paying attentiontaking heed; giving close and thoughtful attention“heedful of the warnings”, “so heedful a writer”, “heedful of what they were doing”