1.Definition: connected by participation or association or use

"We accomplished nothing, simply because of the large number of people involved", "The problems involved", "The involved muscles", "I don't want to get involved", "Everyone involved in the bribery case has been identified"

2.Definition: emotionally involved

3.Definition: entangled or hindered as if e.g. in mire

"The difficulties in which the question is involved"

Related Adjective(s):mired

4.Definition: enveloped

"A castle involved in mist", "The difficulties in which the question is involved"

5.Definition: highly complex or intricate and occasionally devious

"The plot was too involved"

Related Adjective(s):byzantine, convoluted, knotty, tangled, tortuous