обоснован означава в английски

valid▼(well grounded or justifiable, pertinent)
adjective
[UK: ˈvæ.lɪd] [US: ˈvæ.ləd]

well-grounded▼(based on good judgment and solid reasoning)
adjective
[UK: wel ˈɡraʊn.dɪd] [US: ˈwel ˈɡraʊn.dəd]

causeless▼(groundless)
adjective
[UK: ˈkɔːz.ləs] [US: ˈkɔːz.ləs]

unfounded▼(not based on solid reasons or facts)
adjective
[UK: ˌʌn.ˈfaʊn.dɪd] [US: ən.ˈfaʊn.dəd]

unsubstantiated▼(lacking substantiation)
adjective
[UK: ˌʌn.səb.ˈstæn.ʃieɪ.tɪd] [US: ˌʌn.səb.ˈstæn.ʃi.ˌe.təd]