latched on

alive appreciative apprehensive attentive awake cognizant conscious familiar informed mindful receptive wise

acquainted alert appraised apprised au courant cool enlightened go-go groovy grounded heedful hip in the know in the picture into know the score know what's what know-how knowing on the beam on to perceptive plugged in savvy sensible sentient sharp tuned-in up on wise to wised up with it

heedless ignorant inattentive neglectful unaware unconscious unfamiliar unfriendly uninformed unknowledgeable

insensitive