Heedful(a.) Full of heed; regarding with care; cautious; circumspect; attentive; vigilant.
Thesaurus Entries
accommodating, accommodative, advertent, agog, agreeable, alert, all ears, all eyes, assiduous, attentive, aware, canny, careful, cautious, circumspect, complaisant, concentrated, conscientious, conscionable, conscious, considerate, curious, deliberate, delicate, diligent, discreet, earnest, exact, finical, finicking, finicky, fussy, gingerly, guarded, helpful, hesitant, indulgent, intense, intent, intentive, judicious, leaving out nothing, lenient, loving, meticulous, mindful, mindful of others, nice, niggling, noncommittal, obliging, observant, observing, on guard, on the ball, on the job, open-eared, open-eyed, openmouthed, overlooking no possibility, painstaking, pawky, politic, prudent, punctilious, punctual, regardful, safe, scrupulous, slow to act, solicitous, tactful, tender, tentative, thorough, thoughtful, tolerant, unadventurous, uncommunicative, undaring, unenterprising, unprecipitate, watchful