i Register
In some senses, imperfect is marked as obsolete. Watch for register when choosing this word.
VERBS
be
remain
The translation remained imperfect despite her best efforts to capture the author's meaning.
ADV
highly, very
My memory of that day is very imperfect, so I cannot remember all the details.
rather, slightly
The old painting was rather imperfect, but it still had great artistic value.