vague
adj.adj. not clear or specific. You use this when someone's words or ideas are hard to understand because they do not give enough details.
adj. lacking a clear or precise meaning; not clearly expressed or defined. Often describes communication that is intentionally or unintentionally evasive.
His answer was very vague and didn't help me.
The contract used vague language that made it difficult to determine who was responsible for the repairs.
The witness provided a vague description of the suspect, noting only that he wore a dark jacket and appeared to be of average height.
From Middle French vague, from Latin vagus (“uncertain, vague”, literally “wandering, rambling, strolling”).
Commonly modifies nouns related to communication, such as 'promise', 'description', or 'memory'.