Not tedious or tiresome.

That is not loathsome; pleasant, desirable.

As present participle: without grieving, distressing, or injuring.

Not objectionable, not obnoxious or offensive; not offending the senses; not a cause of offence.

Not giving provocation.

Not cloying; that does not sicken or weary a person through excess; not sickly or nauseating.

(un-, prefix1 affix 4.)

(un-, prefix1 affix 1.)

(un-, prefix1 affix 4.)

Not irritating.