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1. Cloudy, misty, or hazy.
2. Lacking definite form or limits; vague: nebulous assurances of future cooperation.
3. Of, relating to, or characteristic of a nebula.

[Middle English, from Latin nebulōsus, from nebula, cloud; see nebh- in Indo-European roots.]

neb′u·lous·ly adv.
neb′u·lous·ness n.
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Adv.1.nebulously - in a nebulous and indefinite manner
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References in classic literature ?
She had never conceived of the form of God except as nebulously naked, and the thought- association was startling.
The pathophysiology of both AD and psoriasis is nebulously complex, sharing a similar theme of immune dysregulation, but historically polar opposites based on the different branches of the immune response implicated.
A proper and principled military policy would reserve the might of our armed forces for defense of our own territory, including embassies abroad--but not nebulously defined "American interests.
4) But Baker, writing in 1643, has at hand a noun for an identity that was only nebulously defined when Donne was at the Inns of Court in the early 1590s.
In a political moment now often referred to as 'postfeminist'--a popular term that conveys a sense of achievement misguidedly negating any further need for feminism while referencing a nebulously contemporary era starting around the late 1990s--these narratives seem incongruous.
Neo-noir's boundaries are so nebulously defined that I could imagine a convincing case.
Dislocation is the substance of something other than White fulfillment and rediscovery, and thus the assemblage of minority universes remains unpenetrated and nebulously strong versus American military and economic power.
The following proof involves two fragmented terms and plays them off one another in nebulously sequenced words: "a woman face" appears, followed by a gap, followed by "for to see monstrosity.
The issue came to a head following moves by senators Grace Poe and Francis Escudero to run for either president or vice president on a not-yet-named political vehicle, nebulously tagged as a third party or third force.
Rather, it grants additional powers for the use of force and extends the 2001 AUMF from al Qaeda and the Taliban to ISIL, al Qaeda in the Arabian Peninsula (AQAP), al-Shabbab and, most nebulously, to forces that are "associated" with any of these groups.
Not that optimizing hardware utilization was a simple task back then, but current HPC users and systems administrators must now manage workflows that may include a mix-n-match collection of heterogeneous hardware like CPUs, GPUs and Intel Xeon Phi devices installed in multiple, distributed clusters that may be located within an organization, physically located across multiple data centers around the world, and may even include resources nebulously contained within the cloud.
Still, decision support tools can be nebulously defined or even taken for granted, both at a provider's own peril.