noun

1. a puzzling or inexplicable occurrence or situation
2. a person of puzzling or contradictory character
3. a saying, question, picture, etc., containing a hidden meaning; riddle

Synonym
problem

noun

1. a puzzling or inexplicable occurrence or situation
2. a person of puzzling or contradictory character
3. a saying, question, picture, etc., containing a hidden meaning; riddle

Synonym
problem

adjective
1. made hard; hardened
2. insensitive; indifferent; unsympathetic
3. having a callus; indurated, as parts of the skin exposed to friction

verb (used with or without object)
4. to make or become hard or callous

Synonyms
hard, inured, insensible, obtuse
Antonyms
soft, sensitive

adjective
1. hard to understand; recondite; esoteric
2. Obsolete; secret; hidden

Synonyms
incomprehensible, unfathomable, arcane
Antonyms
clear, uncomplicated, simple; obvious

adjective
1. pertaining to rudiments or first principles; elementary
2. of the nature of a rudiment; undeveloped or vestigial.
3. primitive

Synonyms
fundamental, initial, elementary, embryonic
Antonyms
advanced, mature

noun
1. a document describing the major features of a proposed literary work, project, business venture, etc., in enough detail so that prospective investors, participants, or buyers may evaluate it:
Don’t buy the new stock offering until you read the prospectus carefully.
2. a brochure or other document describing the major features, attractions, or services of a place, institution, or business to prospective patrons, clients, owners, or members.

adjective
1. unusually advanced or mature in development, especially mental development.
a precocious child.
2. prematurely developed, as the mind, faculties, etc.
3. of or relating to premature development.
4. Botany. flowering, fruiting, or ripening early, as plants or fruit.
bearing blossoms before leaves, as plants. appearing before leaves, as flowers.

adjective
unusually advanced or mature in development, especially mental development

adjective
of or relating to a practical point of view or practical considerations

adjective
having keen mental perception and understanding; discerning

Synonyms
perceptive, acute, shrewd, penetrating

noun

knowledge acquired by study, research, etc.; learning; scholarship

Synonym
learning

verb

to scatter or spread widely, as though sowing seed; promulgate extensively; broadcast; disperse