Harass

assetjar

(to persistently bother (someone, or a group of people) physically or psychologically when such behaviour is illegal and/or unwanted, especially over an extended period)

assetjar

(to put excessive burdens upon (someone))

assetjar

(to trouble (someone, or a group of people) through repeated military-style attacks)

fastiguejar

(to annoy (someone) frequently or systematically — see also pester)

molestar

(to annoy (someone) frequently or systematically — see also pester)

vexar

(to annoy (someone) frequently or systematically — see also pester)