Etymology
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tenuous (adj.)

1590s, "thin, unsubstantial," irregularly formed from Latin tenuis "thin, drawn out, meager, slim, slender," figuratively "trifling, insignificant, poor, low in rank," from PIE root *ten- "to stretch," + -ous. The correct form with respect to the Latin is tenuious. The figurative sense of "having slight importance, not substantial" is found from 1817 in English. Related: Tenuously; tenuousness.

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Definitions of tenuous

tenuous (adj.)
having thin consistency;
a tenuous fluid
tenuous (adj.)
very thin in gauge or diameter;
a tenuous thread
tenuous (adj.)
lacking substance or significance;
a tenuous argument
Synonyms: flimsy / fragile / slight / thin
From wordnet.princeton.edu