closely-allied
microcomputer-based
motiveless
much-neglected
nondescript
unanalysed
unattained
unattempted
unclassified
uncollected
uncomprehended
undisclosed
undreamed-of
unguessed
unimagined
unpitied
unrealized
unrecognised
unregretted
unreleased
unrevealed
unsolved
untapped
unthought-of
unutilized