an automatic signal (usually a sound) warning of danger
a warning serves to make you more alert to danger
condition of heightened watchfulness or preparation for action; "bombers were put on alert during the crisis"
engaged in or accustomed to close observation; "caught by a couple of alert cops"; "alert enough to spot the opportunity when it came"; "constantly alert and vigilant, like a sentinel on duty"
mentally perceptive and responsive;"an alert mind"; "alert to the problems"; "alive to what is going on"; "awake to the dangers of her situation"; "was now awake to the reality of his predicament"
quick and energetic;
warn or arouse to a sense of danger or call to a state of preparedness; "The empty house alarmed him"; "We alerted the new neighbors to the high rate of burglaries"
intensely enthusiastic about or preoccupied with; "crazy about cars and racing"; "he is potty about her"
mentally or physically infirm with age; "his mother was doddering and frail"
of or created by one without formal training; simple or naive in style; "primitive art such as that by Grandma Moses is often colorful and striking"
marked by or showing unaffected simplicity and lack of guile or worldly experience; "a teenager's naive ignorance of life"; "the naive assumption that things can only get better"; "this naive simple creature with wide friendly eyes so eager to believe appearances"
not initiated; deficient in relevant experience; "it seemed a bizarre ceremony to uninitiated western eyes"; "he took part in the experiment as a naive subject"
lacking information or instruction; "lamentably unenlightened as to the laws"