chummy

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Intimate; friendly.

from The Century Dictionary.

• Companionable; sociable; intimate: as, I found him very chummy.

from the GNU version of the Collaborative International Dictionary of English.

• adjective colloquial having the relationship of friends or pals.
• adjective informal associated on close terms.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective friendly; on, or trying to be on, intimate terms

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• adjective (used colloquially) having the relationship of friends or pals
• adjective (used informally) associated on close terms