Synonyms of observative

2 Syllables

alert, knowing, cautious, conscious, watchful, mindful, heedful, sharp-eyed, thoughtful, arrect, wary, cagey, chary

3 Syllables

observing, vigilant, observant, sensible, conscientious, conversant, advertent, careful, respectful, cognizant, regardful

4 Syllables

knowledgeable, solicitous, intentive

5 Syllables

apprehensive