untimely
1. un.time.ly \-le-\ av 1: at an inopportune time : UNSEASONABLY 2:
PREMATURELY
2. untimely aj 1: occurring or done before the due, natural, or proper time
: too early : PREMATURE {~ death} 2: INOPPORTUNE, UNSEASONABLE {an ~ joke}
{~ frost}
Webster's English Dictionary