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"
a friendly understanding between political powers
an informal alliance between countries
with effort or force or vigor; "the team played hard"; "worked hard all day"; "pressed hard on the lever"; "hit the ball hard"; "slammed the door hard"
not easy; requiring great physical or mental effort to accomplish or comprehend or endure; "a difficult task"; "nesting places on the cliffs are difficult of access"; "difficult times"; "why is it so hard for you to keep a secret?"
to the full extent possible; all the way; "hard alee"; "the ship went hard astern"; "swung the wheel hard left"
characterized by effort to the point of exhaustion; especially physical effort; "worked their arduous way up the mining valley"; "a grueling campaign"; "hard labor"; "heavy work"; "heavy going"; "spent many laborious hours on the project"; "set a punishing pace"
slowly and with difficulty; "prejudices die hard"
dried out; "hard dry rolls left over from the day before"
causing great damage or hardship; "industries hit hard by the depression"
of a substantial character and not frivolous or superficial; "work of solid scholarship"; "based on solid facts"
of definite shape and volume; firm; neither liquid nor gaseous; "ice is water in the solid state"
entirely of one substance with no holes inside; "a solid block of wood"
financially sound; "the bank is solid and will survive this attack"
of good quality and condition; solidly built; "a solid foundation"; "several substantial timber buildings"
providing abundant nourishment; "a hearty meal"; "good solid food"; "ate a substantial breakfast"; "four square meals a day"
uninterrupted in space; having no gaps or breaks; "a solid line across the page"; "solid sheets of water"
impenetrable for the eye; "solid blackness"
a three-dimensional shape
having three dimensions; "a solid object"
the state in which a substance has no tendency to flow under moderate stress; resists forces (such
a written agreement between two states or sovereigns