1. Not feeling or showing gratitude
   - ungrateful, thankless

See also: unappreciative

• reconcile
• reconciled
• reconcilement
• reconciler
• reconciliation
• reconciliatory
• reconciling
• recondite
• reconditeness
• recondition
• reconfigure
• reconfirm
• reconnaissance
• reconnaissance by fire
• reconnaissance in force
• reconnaissance mission
• reconnaissance plane
• reconnaissance vehicle
• reconnect
• reconnoiter
• reconnoitering
• reconnoitre
• reconnoitring
• reconquer
• reconquest