The Oxford Thesaurus An A-Z Dictionary of Synonyms - careful adj.

1) cautious, wary, circumspect, chary, prudent, watchful, aware, alert, vigilant: These days one cannot be too careful about walking in the city at night. 2) meticulous, painstaking, attentive, punctilious, (well-) organized, systematic, precise, fastidious, thorough, scrupulous, conscientious, particular, finicky, finical, fussy: The police conducted a careful search for weapons.