undeceptive (?.)
- guileless
- unaffected
- unassumed
- unassuming
- unbeguileful
- unbeguiling
- uncalculating
- undeceitful
- undeceiving
- undesigning
- undisguised
- undisguising
- undissembling
- undissimulated
- undissimulating
- unfeigned
- unfeigning
- unflattering
- unpretended
- unpretending
- untrimmed
- unvarnished