apprehensive (adj.)

• afraid
• agitated
• alive
• all-knowing
• anxious
• apperceptive
• awake
• aware
• bothered
• cognizant
• comprehending
• concerned
• conscious
• disquieted
• disturbed
• edgy
• excitable
• fearful
• foreboding
• frightened
• high-strung
• insightful
• intelligent
• irritable
• knowing
• knowledgeable
• mindful
• nervous
• nervy
• omniscient
• overanxious
• overstrung
• panicky
• perceptive
• percipient
• perspicacious
• perturbed
• prehensile
• sagacious
• sensible
• sentient
• shrewd
• solicitous
• strained
• suspenseful
• taut
• tense
• troubled
• understanding
• uneasy
• ware
• wise
• witting
• zealous