undoubting (?.)

• absolute
• admitting no exception
• all-out
• arrogant
• assured
• believing
• categorical
• certain
• clear
• cocksure
• complete
• conclusive
• confident
• convinced
• credulous
• decided
• decisive
• definite
• definitive
• determinate
• determined
• devout
• dogmatic
• doting
• doubtless
• downright
• easily taken in
• easy of belief
• entire
• explicit
• express
• faithful
• fideistic
• final
• fixed
• flat
• flat-out
• fond
• global
• hubristic
• implicit
• impressed with
• inappealable
• inclined to believe
• indisputable
• infatuated
• out-and-out
• outright
• overconfident
• overconfiding
• overcredulous
• oversure
• overtrustful
• overtrusting
• overweening
• peremptory
• perfect
• persuaded
• pietistic
• pious
• pistic
• poised
• pompous
• positive
• proud
• reassured
• round
• satisfied
• secure
• self-assured
• self-confident
• self-important
• self-reliant
• sold on
• straight
• straight-out
• superstitious
• sure
• total
• trustful
• trusting
• unafraid
• uncircumscribed
• unconditional
• unconditioned
• uncritical
• under the impression
• undoubtful
• unequivocal
• unfaltering
• unhampered
• unhesitating
• unlimited
• unmistakable
• unmitigated
• unqualified
• unquestioning
• unreserved
• unrestricted
• unskeptical
• unsuspecting
• unsuspicious
• unwaivable
• unwavering
• utter
• whole
• without exception
• without reserve