The 3 words Idle, idol and ideal are a little confusing
Idle means something not in use, empty or doing nothing.
- Are you an idle student?
Idle is an adjective and basically means Lazy or doing nothing.
Idol is a noun and it is used to say that someone is excessively admired.
- American Idol
Ideal is also an adjective and It means something is perfect or the most suitable.
- The swimming pool is ideal for a quick dip.