1. valid   sound or logically convincing.   pertaining to night.   with a saw-toothed edge.   elastic or having the ability to bounce back.   Hint Half-n-half Clue   2. spatial   capable of being shaped by hammering or pliable.   pertaining to night.   permeable or having pores.   pertaining to space.   Half-n-half Clue   3. striated   between one and two right angles; blunt or dull.   marked with ridges or parallel grooves on surface.   shaped like an egg.   bony or having bones.   Half-n-half Clue   4. optimum   best or most favorable.   pertaining to the moon.   penetrable or allowing fluids to pass through.   caustic or sharp in taste or smell.   Half-n-half Clue   5. latent   best or most favorable.   pertaining to sugar or sweet.   hidden potential, not manifest.   pertaining to night.   Half-n-half Clue   6. theoretical   not transparent or with no light transmission.   for a short time or momentary.   pertaining to theory; not practical or applied.   slanting or indirect.   Half-n-half Clue   7. random   allowing light to pass freely; clearly apparent.   haphazard or without definite pattern.   pertaining to seed or semen; germinal.   small enough or unimportant as to be neglected.   Half-n-half Clue