"thinner" in the noun sense

1. dilutant, diluent, thinner

a diluting agent

"thinner" in the adjective sense

1. thin

of relatively small extent from one surface to the opposite or in cross section

"thin wire"

"a thin chiffon blouse"

"a thin book"

"a thin layer of paint"

2. thin, lean

lacking excess flesh

"you can't be too rich or too thin"

"Yon Cassius has a lean and hungry look"-Shakespeare

3. slender, thin

very narrow

"a thin line across the page"

4. sparse, thin

not dense

"a thin beard"

"trees were sparse"

5. thin

relatively thin in consistency or low in density not viscous

"air is thin at high altitudes"

"a thin soup"

"skimmed milk is much thinner than whole milk"

"thin oil"

6. thin

of sound) lacking resonance or volume

"a thin feeble cry"

7. thin

lacking spirit or sincere effort

"a thin smile"

8. flimsy, fragile, slight, tenuous, thin

lacking substance or significance

"slight evidence"

"a tenuous argument"

"a thin plot"

"a fragile claim to fame"

Source: WordNet® (An amazing lexical database of English)

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