Causing trouble, annoyance, or inconvenience; troublesome or irritating.
Formed from bother (of uncertain origin, possibly from Irish bodhaire 'to deafen') plus the suffix -some meaning 'characterized by.' The combination creates an adjective meaning 'full of bother.'
Bothersome exemplifies how English creates descriptive words by layering suffixes - the -some ending transforms the verb 'bother' into an adjective that suggests something inherently possesses the quality of causing bother, like troublesome or tiresome.
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