untimely

adjectives

badly timed
"an ill-timed intervention"; "you think my intrusion unseasonable"; "an untimely remark"; "it was the wrong moment for a joke"
ill-timed, unseasonable, untimely, wrong
is derived from
untimeliness
uncommonly early or before the expected time
"illness led to his premature death"; "alcohol brought him to an untimely end"
premature, untimely
is derived from
untimeliness

adverbs

too soon; in a premature manner
"I spoke prematurely"
prematurely, untimely