любознательный означает в английский

curious▼(tending to ask questions, or to want to explore or investigate, see also: inquisitive)
adjective
[UK: ˈkjʊə.rɪəs] [US: ˈkjʊ.riəs]

inquisitive▼(eager to acquire knowledge)
adjective
[UK: ɪn.ˈkwɪ.zə.tɪv] [US: ˌɪn.ˈkwɪ.zə.tɪv]