circumspect
Meaning: cautious
Usage: Though I promised Rachel’s father I would bring her home promptly by midnight, it would have been more circumspect not to have specified a time.
prudence
Meaning: cautious judgment; carefulness
Usage: After losing a fortune in a stock market crash, my father vowed to practice greater prudence in future investments.
vigilant
Meaning: watchful, alert
Usage: The guards remained vigilant throughout the night, but the enemy never launched the expected attack.
solicitous
Meaning: concerned, attentive
Usage: Jim, laid up in bed with a nasty virus, enjoyed the solicitous attentions of his mother, who brought him soup and extra blankets.