creaky

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

• adjective Tending to creak.
• adjective Shaky or infirm, as with age; decrepit.
• adjective Linguistics Of or relating to a speech sound that is produced with the vocal cords loosely compressed, resulting in irregular, very low-pitched voicing.

from The Century Dictionary.

• Creaking; apt to creak.

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

• adjective worn down with age or use; in poor condition.
• adjective producing a rasping or grating sound under some circumsatance.
• adjective aching when flexed; -- of body parts.

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

• adjective Tending to creak
• adjective Worn down by overuse; decrepit
• adjective arthritic or rheumatic
• adjective linguistics Of or relating to a special kind of phonation in which the arytenoid cartilages in the larynx are drawn together, compressing the vocal folds.

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

• adjective worn and broken down by hard use
• adjective having a rasping or grating sound
• adjective of or pertaining to arthritis