What does «incansable» mean in Spanish?

Who does not get tired of doing a certain thing, hard to get tired of.

Examples of use in Spanish: "es un estudiante incansable"

"manos diestras e incansables"

"un hombre incansable

"un aleteo incansable".
Which is typical of a tireless person.

Examples of use in Spanish: "fe incansable",

"hombre de incansable de espíritu emprendedor".