-ive

(redirected from -iveness)

-ive

suff.
Performing or tending toward a specified action: demonstrative.

[Middle English, from Old French, from Latin -īvus, adj. suff.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

-ive

suffix
1. (forming adjectives) indicating a tendency, inclination, character, or quality: divisive; prohibitive; festive; massive.
2. (forming nouns of adjectival origin): detective; expletive.
[from Latin -īvus]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

I've

(aɪv)
contraction of I have.

-ive

a suffix of adjectives (and nouns of adjectival origin) expressing tendency, disposition, function, connection, etc.: active; corrective; detective; sportive.
[< Latin -īvus; in some words, representing French -ive, feminine of -if]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.