непреклонен означава в английски

adamant▼(determined; unshakeable; unyielding)
adjective
[UK: ˈæ.də.mənt] [US: ˈæ.də.mənt]

cast iron▼(inflexible or without exception)
adjective
[UK: ˈkɑːst.ˈaɪən] [US: ˈkɑːst.ˈaɪən]

grim [grimmer, grimmest]▼(rigid and unrelenting)
adjective
[UK: ɡrɪm] [US: ˈɡrɪm]

implacable▼(adamant; immovable, see also: adamant; immovable)
adjective
[UK: ɪm.ˈplæk.əb.l̩] [US: ˌɪm.ˈplæk.əb.l̩]

inflexible▼(obstinate, stubborn)
adjective
[UK: ɪn.ˈflek.səb.l̩] [US: ˌɪn.ˈflek.səb.l̩]

relentless▼(unrelenting or unyielding in severity)
adjective
[UK: rɪ.ˈlent.ləs] [US: rə.ˈlent.ləs]

rigid▼(rigorous, unbending)
adjective
[UK: ˈrɪ.dʒɪd] [US: ˈrɪ.dʒəd]