subtle

definition: working or spreading in a hidden and usually injurious way
example:
speech part: adjective
synonyms: insidious
definition: difficult to detect or grasp by the mind or analyze
example: Their whole attitude had undergone a subtle change.
speech part: adjective
synonyms: elusive
definition: able to make fine distinctions
example: a subtle mind
speech part: adjective
synonyms:

subtle is explained and pronounced

How subtle is being used?