slow to learn or understand; lacking intellectual acuity; "so dense he never understands anything I say to him"; "never met anyone quite so dim"; "although dull at classical learning, at mathematics he was uncommonly quick"- Thackeray; "dumb officials make some really dumb decisions"; "he was either normally stupid or being deliberately obtuse"; "worked with the slow students"
having high relative density or specific gravity; "dense as lead"
hard to pass through because of dense growth; "dense vegetation"; "thick woods"
permitting little if any light to pass through because of denseness of matter; "dense smoke"; "heavy fog"; "impenetrable gloom"
incapable of or resistant to bending; "a rigid strip of metal"; "a table made of rigid plastic"; "a palace guardsman stiff as a poker"; "stiff hair"; "a stiff neck"
designating an airship or dirigible having a form maintained by a stiff unyielding frame or structure
characterized by forceful and energetic action or activity; "a vigorous hiker"; "gave her skirt a vigorous shake"; "a vigorous campaign"; "a vigorous foreign policy"; "vigorous opposition to the war"
strong and active physically or mentally; "a vigorous old man who spent half of his day on horseback"- W.H.Hudson
living things collectively; "the oceans are teeming with life"
the experience of being alive; the course of human events and activities; "he could no longer cope with the complexities of life"
a motive for living; "pottery was his life"
a living person; "his heroism saved a life"
the organic phenomenon that distinguishes living organisms from nonliving ones; "there is no life on the moon"
the course of existence of an individual; the actions and events that occur in living; "he hoped for a new life in Australia"; "he wanted to live his own life without interference from others"
a characteristic state or mode of living; "social life"; "city life"; "real life"
the period during which something is functional (as between birth and death); "the battery had a short life"; "he lived a long and happy life"
the period between birth and the present time; "I have known him all his life"
the period from the present until death; "he appointed himself emperor for life"
measures taken as a precaution against theft or espionage or sabotage etc.; "military security has been stepped up since the recent uprising"
a guarantee that an obligation will be met
freedom from anxiety or fear; "the watch dog gave her a feeling of security"
a department responsible for the security of the institution's property and workers; "the head of security was a former policeman"
defense against financial failure; financial independence; "his pension gave him security in his old age"; "insurance provided protection against loss of wages due to illness"
property that your creditor can claim in case you default on your obligation; "bankers are reluctant to lend without good security"
a formal declaration that documents a fact of relevance to finance and investment; the holder has a right to receive interest or dividends; "he held several valuable securities"
the state of being free from danger or injury; "we support the armed services in the name of national security"
not changeable or subject to change; "a fixed and unchangeable part of the germ plasm"-Ashley Montagu; "the unchangeable seasons"; "one of the unchangeable facts of life"