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"basic" is also used as a crossword clue. If that's what you saw, the answer is often primitive (9 letters).
Definitions
of or denoting or of the nature of or containing a base
Word origin
From base + -ic.
Used in a sentence
“Flour is a basic ingredient of bread.”
“Having access to the truth is a basic right of the general public.”
“The Hotel Sparta’s accommodation is very basic.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer5 curated clues
01“Fundamental”5 letters
02“Not advanced”5 letters
03“Plain and simple”5 letters
04“Simple”5 letters
05“Simple and essential”5 letters
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