The difference between Pointless and Purposeless

When used as adjectives, pointless means having no point or sharp tip, whereas purposeless means without purpose.

check bellow for the other definitions of Pointless and Purposeless

Pointless as an adjective:

Having no point or sharp tip; terminating squarely or in a rounded end.

Examples:

"a pointless sword"

"a pointless knife"
Pointless as an adjective:

Having no prominent or important feature, as of an argument, discourse, etc.

Examples:

"a pointless remark"

"The [[sequel]] to the film was even more pointless than the original"
Pointless as an adjective:

Having no purpose; purposeless; unable to effect an aim.

Examples:

" Since the decision has already been made, further discussion seems pointless."
Pointless as an adjective (mathematics):

Without points.

Examples:

"a pointless topology"