a. Weak or insubstantial; flimsy: a tenuous argument; a tenuous link between pieces of evidence.
b. Precarious or insecure: tenuous survival.
2. Long and thin; slender: tenuous strands.
3. Having a thin consistency: Pluto's tenuous envelope of gas.
[Latin tenuis; see ten- in the Appendix of Indo-European roots.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.