adjective thinner thin′·ner, thinnest thin′·nest

1. having relatively little depth; of little extent from one surface or side to the opposite thin paper
2. having relatively small diameter in relation to length thin thread
3. having little fat or flesh; lean; gaunt; slender
4. having the constituent elements small in number and not close together; specif.,
   1. scanty in growth; sparsely distributed thin hair
   2. small in size or number thin receipts
   3. lacking body; not thick in consistency; watery thin soup
   4. not dense or heavy thin smoke, a thin snowfall
   5. rarefied, as air at high altitudes
5. of little intensity; dim; faint; pale thin colors
6. of little volume or resonance; high-pitched and weak a thin voice
7. light or sheer, as fabric
8. easily seen through; flimsy or unconvincing a thin excuse
9. lacking solidity, substance, or vigor; slight, weak, vapid, etc. a thin plot, thin argument
10. Photog. lacking in density (sense ): said of an underexposed or underdeveloped negative or print

Etymology: ME thinne < OE thynne, akin to Ger dünn < IE *tenu-, thin < base *ten-, to stretch > L tenuis, thin, tenere, to hold, tendere & Gr teinein, to stretch

adverb thinner thin′·ner, thinnest thin′·nest

transitive verb, intransitive verb thinned, thinning thin′·ning

Etymology: ME thinnen < OE (ge)thynnian < the adj.