1. nocturnal   formed into layers or divided into classes.   pertaining to theory; not practical or applied.   pertaining to night.   suitable for drinking.   Hint Half-n-half Clue   2. negligible   pertaining to a semi-fluid gluey consistency.   small enough or unimportant as to be neglected.   pertaining to motion.   hidden potential, not manifest.   Half-n-half Clue   3. unique   marked with ridges or parallel grooves on surface.   between one and two right angles; blunt or dull.   without parallel or equal; one of its kind.   pertaining to heat.   Half-n-half Clue   4. osseous   harmful or poisonous.   pertaining to the moon.   bony or having bones.   pertaining to motion.   Half-n-half Clue   5. partial   unattractive or repulsive.   pertaining to disease.   incomplete or biased.   motionless or unchanging.   Half-n-half Clue   6. refractory   pertaining to the earth.   pertaining to the stars.   pertaining to seed or semen; germinal.   stubborn or rebellious.   Half-n-half Clue   7. obtuse   marked with ridges or parallel grooves on surface.   between one and two right angles; blunt or dull.   stubborn or rebellious.   unattractive or repulsive.   Half-n-half Clue