Below are the words that matched your query...
Unhindered
- not slowed or blocked or interfered with; "an outlet for healthy and unhampered action"; "a priest unhampered by scruple"; "the new stock market was unhampered by tradition"
Unretentive
- (of memory) deficient in retentiveness or range; "a short memory"
Unreflected
- (especially of incident sound or light) not turned back by physical reflection
Unreverberant
- not reverberant; lacking a tendency to reverberate
Unrewarding
- not rewarding; not providing personal satisfaction
Ungratifying
- not likely to be rewarded; "grading papers is a thankless task"