depressed

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

• adjective Low in spirits; dejected.
• adjective Suffering from clinical depression.
• adjective Sunk below the surrounding region.
• adjective Lower in amount, degree, or position.
• adjective Sluggish in growth or activity.
• adjective Suffering from social and economic hardship.
• adjective Botany Flattened downward, as if pressed from above.
• adjective Zoology Flattened along the dorsal and ventral surfaces.

from The Century Dictionary.

• Pressed down; lowered; put on a level with or below the surface: as, a depressed railroad. Specifically
• In anatomy and zoology, pressed downward, or flattened from above, and therefore broader than high: as, a depressed fish—for example, the skate; the depressed bill of a bird, as that of the swallow: opposed to compressed.
• In botany, flattened vertically; sunk below the surrounding margin: as, a depressed plant (one whose growth, is lateral rather than upward).
• In heraldry, surmounted or debruised. See debruised.

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

• adjective Pressed or forced down; lowed; sunk; dejected; dispirited; sad; humbled.
• adjective Concave on the upper side; -- said of a leaf whose disk is lower than the border.
• adjective Lying flat; -- said of a stem or leaf which lies close to the ground.
• adjective (Zoöl.) Having the vertical diameter shorter than the horizontal or transverse; -- said of the bodies of animals, or of parts of the bodies.

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

• verb Simple past tense and past participle of depress.
• adjective unhappy, and blaming oneself rather than others; despondent
• adjective Suffering from clinical depression.
• adjective Suffering damaging effects of economic recession.

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

• adjective lower than previously
• adjective filled with melancholy and despondency
• adjective flattened downward as if pressed from above or flattened along the dorsal and ventral surfaces