1. Difficult to detect or grasp by the mind or analyse
   "his whole attitude had undergone a subtle change"; "a subtle difference"
   - elusive 
2. Able to make fine distinctions
   "a subtle mind" 
3. Working or spreading in a hidden and usually injurious way
   "a subtle poison"
   - insidious, pernicious

Derived forms: subtler, subtlest

See also: harmful, impalpable, perceptive, subtly

Encyclopedia: Subtle

• order Geophilomorpha
• order Geraniales
• order Ginkgoales
• order Gnetales
• order Graminales
• order Gregarinida
• order Gruiformes
• order Guttiferales
• order Gymnophiona
• order Haemosporidia
• order Haplosporidia
• order Heliozoa
• order Helotiales
• order Hemiptera
• order Heterosomata
• order Heterotrichales
• order Hymenogastrales
• order Hymenoptera
• order Hypericales
• order Hypermastigina
• order Hypocreales
• order Hyracoidea
• order Ichthyosauria
• order Ictodosauria
• order Insectivora