The Collaborative International Dictionary of English v.0.48:
Untimeliness \Un*time"li*ness\, n. Unseasonableness. [1913 Webster]WordNet (r) 3.0 (2006):
untimeliness n 1: being at an inappropriate time [syn: unseasonableness, untimeliness] [ant: seasonableness, timeliness] 2: the quality of occurring at an inconvenient time [syn: inopportuneness, untimeliness] [ant: opportuneness, patness, timeliness]