(a.) Full of heed; regarding with care; cautious; circumspect; attentive; vigilant.

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