sincere (adj.)

• abandoned
• aboveboard
• actual
• afire
• ardent
• artless
• authentic
• bluff
• blunt
• bound
• broad
• brusque
• burning
• candid
• childlike
• committed
• confiding
• dear
• decided
• decisive
• dedicated
• definite
• determined
• devoted
• devout
• direct
• downright
• earnest
• explicit
• faithful
• fervent
• fervid
• fiery
• flaming
• forthright
• frank
• free
• free-spoken
• genuine
• good
• guileless
• heart-to-heart
• heartfelt
• hearty
• heated
• honest
• hot
• hot-blooded
• impassioned
• ingenuous
• innocent
• intense
• intent
• lawful
• legitimate
• lifelike
• literal
• loyal
• meant
• naive
• natural
• naturalistic
• obstinate
• open
• openhearted
• original
• outspoken
• passionate
• perfervid
• persevering
• persistent
• plain
• pure
• purposeful
• real
• realistic
• red-hot
• relentless
• resolute
• resolved
• rightful
• round
• serious
• simple
• single-minded
• spirited
• sterling
• straight
• straight-out
• straightforward
• sure-enough
• tenacious
• transparent
• true
• trustful
• trusting
• truthful
• unadulterated
• unaffected
• unassuming
• unchecked
• uncolored
• unconstrained
• undisguised
• undistorted
• unequivocal
• unfeigned
• unflattering
• unguarded
• unimagined
• unpretending
• unpretentious
• unqualified
• unreserved
• unrestrained
• unromantic
• unsophisticated
• unsuspicious
• unvarnished
• unwary
• vehement
• veracious
• verbal
• verbatim
• veridical
• verisimilar
• warm
• white-hot
• wholehearted
• zealous