Definition of thinnest:
(adj) :
Having little body fat or flesh; slim; slender; lean; gaunt.
(adj) :
Having little thickness or extent from one surface to its opposite.
(adj) :
Very narrow in all diameters; having a cross section that is small in all directions.
(adj) :
Scarce; not close, crowded, or numerous; not filling the space.
(adj) :
Lacking body or volume; small; feeble; not full.
(adj) :
Slight; small; slender; flimsy; superficial; inadequate; not sufficient for a covering.