naked

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

• adjective Having no clothing on the body; nude.
• adjective Having no covering, especially the usual one.
• adjective Devoid of vegetation, trees, or foliage.
• adjective Being without addition, concealment, disguise, or embellishment.
• adjective Devoid of a specified quality, characteristic, or element.
• adjective Exposed to harm; vulnerable.
• adjective Not enclosed in an ovary.
• adjective Unprotected by scales.
• adjective Lacking a perianth.
• adjective Without leaves or pubescence.
• adjective Zoology Lacking outer covering such as scales, fur, feathers, or a shell.

from The Century Dictionary.

• Said of a vessel's bottom when her copper is stripped off.
• Unclothed; without clothing or covering; bare; nude: as, a naked body or limb.
• Without covering; especially, without the usual or customary covering; exposed; bare: as, a naked sword.
• Specifically— In botany, noting flowers without a calyx, ovules or seeds not in a closed ovary (gymnosperms), stems without leaves, and parts destitute of hairs.
• In zoology, noting mollusks when the body is not defended by a calcareous shell.
• In entomology, without hairs, bristles, scales, or other covering on the surface.
• Open to view.
• Mere; bare; simple.
• Having no means of defense or protection against an enemy's attack, or against other injury; unarmed; exposed; defenseless.
• Bare; unprovided; unfurnished; destitute.
• In music, noting the harmonic interval of a fifth or fourth, when taken alone.
• In law, unsupported by authority or consideration: as, a naked overdraft; a naked promise.
• Synonyms Uncovered, undressed.
• Unprotected, unsheltered, unguarded.

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

• adjective Having no clothes on; uncovered; nude; bare
• adjective Having no means of defense or protection; open; unarmed; defenseless.
• adjective Unprovided with needful or desirable accessories, means of sustenance, etc.; destitute; unaided; bare.
• adjective Without addition, exaggeration, or excuses; not concealed or disguised; open to view; manifest; plain.
• adjective Mere; simple; plain.
• adjective (Bot.) Without pubescence; ; bare, or not covered by the customary parts, as a flower without a perianth, a stem without leaves, seeds without a pericarp, buds without bud scales.
• adjective (Mus.) Not having the full complement of tones; -- said of a chord of only two tones, which requires a third tone to be sounded with them to make the combination pleasing to the ear.
• adjective a bed the occupant of which is naked, no night linen being worn in ancient times.
• adjective the eye alone, unaided by eyeglasses, or by telescope, microscope, or other magnifying device.
• adjective (Zoöl.) See Hydromedusa.
• adjective (Carp.) the timberwork which supports a floor.
• adjective (Zoöl.) a nudibranch.
• adjective (Bot.) a large rhamnaceous tree (Colibrina reclinata) of Southern Florida and the West Indies, having a hard and heavy heartwood, which takes a fine polish.

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

• adjective Not wearing any clothes; without clothing on the genitals or female nipples.
• adjective Glib, without decoration, put bluntly.
• adjective Unprotected; (by extension) without a condom.
• adjective Uncomfortable; as if missing something important.
• verb Simple past tense and past participle of nake.

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

• adjective (of the eye or ear e.g.) without the aid of an optical or acoustical device or instrument
• adjective completely unclothed
• adjective lacking any cover
• adjective having no protecting or concealing cover
• adjective devoid of elaboration or diminution or concealment; bare and pure