well

nouns

a deep hole or shaft dug or drilled to obtain water or oil or gas or brine
is a type of (narrower)
a hole in the ground made by excavating
a cavity or vessel used to contain liquid
is a type of (narrower)
an object used as a container (especially for liquids)
an abundant source
"she was a well of information"
an open shaft through the floors of a building (as for a stairway)
is a type of (narrower)
a vertical passageway through a building (as for an elevator)
an enclosed compartment in a ship or plane for holding something as e.g. fish or a plane's landing gear or for protecting something as e.g. a ship's pumps
is a type of (narrower)
a partitioned section, chamber, or separate room within a larger enclosed area

verbs

come up, as of a liquid
"Tears well in her eyes"; "the currents well up"

adjectives

in good health especially after having suffered illness or injury
"appears to be entirely well"; "the wound is nearly well"; "a well man"; "I think I'm well; at least I feel well"
is derived from
antonym
is similar to
having no symptoms of illness or disease
is similar to
freed from illness or injury
"the patient appears cured"; "the incision is healed"; "appears to be entirely recovered"; "when the recovered patient tries to remember what occurred during his delirium"- Normon Cameron
see also
physically and mentally sound or healthy
"felt relaxed and fit after their holiday"; "keeps fit with diet and exercise"
see also
having or indicating good health in body or mind; free from infirmity or disease
"a rosy healthy baby"; "staying fit and healthy"
resulting favorably
"it's a good thing that I wasn't there"; "it is good that you stayed"; "it is well that no one saw you"; "all's well that ends well"
wise or advantageous and hence advisable
"it would be well to start early"
is similar to
worthy of being recommended or suggested; prudent or wise
"such action is neither necessary nor advisable"; "extreme caution is advisable"; "it is advisable to telephone first"

adverbs

(often used as a combining form) in a good or proper or satisfactory manner or to a high standard (`good' is a nonstandard dialectal variant for `well')
"the children behaved well"; "a task well done"; "the party went well"; "he slept well"; "a well-argued thesis"; "a well-seasoned dish"; "a well-planned party"; "the baby can walk pretty good"
antonym
thoroughly or completely; fully; often used as a combining form
"The problem is well understood"; "she was well informed"; "shake well before using"; "in order to avoid food poisoning be sure the meat is well cooked"; "well-done beef", "well-satisfied customers"; "well-educated"
indicating high probability; in all likelihood
"I might well do it"; "a mistake that could easily have ended in disaster"; "you may well need your umbrella"; "he could equally well be trying to deceive us"
(used for emphasis or as an intensifier) entirely or fully
"a book well worth reading"; "was well aware of the difficulties ahead"; "suspected only too well what might be going on"
domain usage
a modifier that has little meaning except to intensify the meaning it modifies
"`up' in `finished up' is an intensifier"; "`honestly' in `I honestly don't know' is an intensifier"
to a suitable or appropriate extent or degree
"the project was well underway"; "the fetus has well developed organs"; "his father was well pleased with his grades"
favorably; with approval
"their neighbors spoke well of them"; "he thought well of the book"
antonym
to a great extent or degree
"I'm afraid the film was well over budget"; "painting the room white made it seem considerably (or substantially) larger"; "the house has fallen considerably in value"; "the price went up substantially"
with great or especially intimate knowledge
"we knew them well"
with prudence or propriety
"You would do well to say nothing more"; "could not well refuse"
with skill or in a pleasing manner
"she dances well"; "he writes well"
antonym
in a manner affording benefit or advantage
"she married well"; "The children were settled advantageously in Seattle"
antonym
in financial comfort
"They live well"; "she has been able to live comfortably since her husband died"
without unusual distress or resentment; with good humor
"took the joke well"; "took the tragic news well"
antonym