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"
scenery consisting of a wooden frame covered with painted canvas; part of a stage setting
a deflated pneumatic tire
a shallow box in which seedlings are started
a musical notation indicating one half step lower than the note named
a level tract of land; "the salt flats of Utah"
commercially inactive; "flat sales for the month"; "prices remained flat"; "a flat market"
not reflecting light; not glossy; "flat wall paint"; "a photograph with a matte finish"
(of a tire) completely or partially deflated
having a relatively broad surface in relation to depth or thickness; "flat computer monitors"
having a surface without slope, tilt in which no part is higher or lower than another; "a flat desk"; "acres of level farmland"; "a plane surface"; "skirts sewn with fine flat seams"
lacking contrast or shading between tones
horizontally level; "a flat roof"
stretched out and lying at full length along the ground; "found himself lying flat on the floor"
sounded or spoken in a tone unvarying in pitch; "the owl's faint monotonous hooting"
lowered in pitch by one chromatic semitone; "B flat"
(of taxes) not increasing as the amount taxed increases
having lost effervescence; "flat beer"; "a flat cola"
a conveyance that transports the letters and packages that are conveyed by the postal system
the system whereby messages are transmitted via the post office; "the mail handles billions of items every day"; "he works for the United States mail service"; "in England they call mail `the post'"
the bags of letters and packages that are transported by the postal service
any particular collection of letters or packages that is delivered; "your mail is on the table"; "is there any post for me?"; "she was opening her post"
cause to be directed or transmitted to another place; "send me your latest results"; "I'll mail you the paper when it's written"
send via the postal service; "I'll mail you the check tomorrow"
a musical notation that makes a note sharp or flat or natural although that is not part of the key signature
without intention (especially resulting from heedless action); "with an inadvertent gesture she swept the vase off the table"; "accidental poisoning"; "an accidental shooting"
associated by chance and not an integral part; "poetry is something to which words are the accidental, not by any means the essential form"- Frederick W. Robertson; "they had to decide whether his misconduct was adventitious or the result of a flaw in his character"
occurring or appearing or singled out by chance; "their accidental meeting led to a renewal of their friendship"; "seek help from casual passers-by"; "a casual meeting"; "a chance occurrence"