im·mense 
(ĭ-mĕns)
(ĭ-mĕns)adj.
1. Very great in size, extent, or amount: an immense cloud.
2. Of great scope or consequence: immense difficulty. See Synonyms at enormous.
[Middle English, from Old French, from Latin immēnsus : in-, not; see IN-1 + mēnsus, past participle of mētīrī, to measure; see mē-2 in the Appendix of Indo-European roots.]
im·mensely adv.
im·menseness n.