Knowledgeable, intelligent, keen.
Sharp, snithy, piercing.
Showing clever resourcefulness in practical matters.
Streetwise, street-smart.
Nigh accurate.
Artful, tricky or cunning.
Severe, intense, hard.
Clever, neat, smart.
Tending to tip or tilt over; unstable.
Of tea, having a large amount of tips, or leaf buds.