Causing someone to fall sleep or feel sleepy; lulling; soporific.
Dull; stupid.
Boring.
Inclined to drowse; heavy with sleepiness
Possessing or pertaining to energy.
Characterised by force or vigour; full of energy; lively, vigorous.
Any material utilized for its release of energy, either as an explosive, propellant, or for pyrotechnic effects.