well

(adjective): In good health.
(adjective): Good, content.
(adjective): Prudent; good; well-advised.
(adverb): (manner) Accurately, competently, satisfactorily.
(adverb): (manner) Completely, fully.
(adverb): (degree) To a significant degree.
(adverb): (degree) Very (as a general-purpose intensifier).
(adverb): In a desirable manner; so as one could wish; satisfactorily; favourably; advantageously.
(interjection): Used to acknowledge a statement or situation.
(interjection): An exclamation of surprise (often doubled or tripled).
(interjection): An exclamation of indignance.
(interjection): Used in speech to express the overcoming of reluctance to say something.
(interjection): Used in speech to fill gaps, particularly at the beginning of a response to a question; filled pause.
(interjection): (Hiberno-English) Used as a greeting