unreasoning
adjective
un·rea·son·ing
| \ ˌən-ˈrēz-niŋ
, -ˈrē-zᵊn-iŋ\
, -ˈrē-zᵊn-iŋ\
Definition of unreasoning
: not reasoning
especially
: not moderated or controlled by reason
unreasoning fear