Of boundless or immeasurable size or extent. See Synonyms at enormous.
Informal Surpassingly good; excellent.
[Middle English, from Old French, from Latin immēnsus : in-, not; see in-1 + mēnsus, past participle of mētīrī, to measure; see mē-2 in Indo-European roots.] im·mense'ly adv., im·mense'ness n.