Synonyms of the word

underlying

• adj. lying underneath.
• adj. basic or fundamental.
• adj. implicit.
• n. (finance) The entity from whose performance a derivative derives its value.

basic

• adj. Necessary, essential for life or some process.
• adj. Elementary, simple, fundamental, merely functional.
• adj. (chemistry) Of or pertaining to a base; having a pH greater than 7.
• adj. (slang) Unremarkable or uninteresting; boring; uncool.
• n. A necessary commodity, a staple requirement.
• n. An elementary building block, e.g. a fundamental piece of knowledge.
• n. (military) Basic training.

fundamental

• n. (usually in the plural) A leading or primary principle, rule, law, or article, which serves as the groundwork…
• n. (physics) The lowest frequency of a periodic waveform.
• n. (music) The lowest partial of a complex tone.
• adj. Pertaining to the foundation or basis; serving for the foundation.
• adj. Essential, as an element, principle, or law; important; original; elementary.

implicit

• adj. Implied indirectly, without being directly expressed.
• adj. Contained in the essential nature of something but not openly shown.
• adj. Having no reservations or doubts; unquestioning or unconditional; usually said of faith or trust.
• adj. (obsolete) entangled, twisted together.

inexplicit

• adj. Not explicit.

inherent

• adj. Naturally as part or consequence of something.

rudimentary

• adj. Of or relating to one or more rudiments.
• adj. Basic; minimal; with less than, or only the minimum, necessary.
• n. (zoology, usually in the plural) One of the rudimentary mammae of boars.

subjacent

• adj. Lying beneath or at a lower level; underlying.