Too slight or subtle to be grasped easily by the mind
Not plain or distinct to the senses or the mind; esp., so slight, gradual, subtle, etc. as not to be easily perceived
That cannot be conclusively determined or explained
That cannot be discerned; imperceptible
That cannot be discerned or recognized; imperceptible
Having lost sensation; unconscious
Incapable of being perceived by the senses.
Out of sight; not apparent
Not readily noticeable.
Find another word for unobservable. In this page you can discover 11 synonyms, antonyms, idiomatic expressions, and related words for unobservable, like: impalpable, imperceptible, imponderable, inappreciable, indiscernible, indistinguishable, insensible, intangible, invisible, unnoticeable and knowledge.