Learn English – Single word for someone who “leads people on”

Stalling could work here:

to delay, especially by evasion or deception.

I asked him to do it, but he keeps stalling.

To procrastinate means to put off, so it could work, too, in some circumstances.

There are many other synonyms, each with different nuances of meaning. Thesaurus.com presents many choices.

A no-nonsense person just gets it done.