The difference between Painful and Painless

When used as adjectives, painful means causing pain or distress, either physical or mental, whereas painless means free from pain.

check bellow for the other definitions of Painful and Painless

Painful as an adjective:

Causing pain or distress, either physical or mental.
Painful as an adjective:

Afflicted or suffering with pain (of a body part or, formerly, of a person).
Painful as an adjective:

Requiring effort or labor; difficult, laborious.
Painful as an adjective (now, _, rare):

Painstaking; careful; industrious.
Painful as an adjective (informal):

Very bad, poor.

Examples:

"His violin playing is painful."