undeceitful (?.)

• guileless
• unaffected
• unassumed
• unassuming
• unbeguileful
• unbeguiling
• uncalculating
• undeceiving
• undeceptive
• undesigning
• undisguised
• undisguising
• undissembling
• undissimulated
• undissimulating
• unfeigned
• unfeigning
• unflattering
• unpretended
• unpretending
• untrimmed
• unvarnished