• Webster's Revised Unabridged Dictionary
    • a Structureless Without a definite structure, or arrangement of parts; without organization; devoid of cells; homogeneous; as, a structureless membrane.
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Century Dictionary and Cyclopedia
    • structureless Without structure; devoid of distinct parts; unorganized; unformed; hence, lacking arrangement; informal; specifically, in biology, having no distinction of parts or organs; not histologically differentiated; not forming or formed into a tissue; homogeneous; amorphous.
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In literature:

Its body-substance is a structureless sarcode.
"Scientific American Supplement, Vol. XIX, No. 470, Jan. 3, 1885" by Various
But is the amoeba really structureless?
"The Whence and the Whither of Man" by John Mason Tyler
We are thus face to face with a situation which has its closest counterpart in the structureless fleets of the seventeenth century.
"Some Principles of Maritime Strategy" by Julian Stafford Corbett
The small particles of protoplasm which constitute "cells" are far indeed from being structureless.
"Young Folks' Library, Volume XI (of 20)" by Various
In this the formative cells (the cartilage corpuscles) are enjellied in a clear structureless matrix (Figure XII.
"Text Book of Biology, Part 1: Vertebrata" by H. G. Wells
There are, however, other means of arriving at structureless cellulose nitrates.
"Researches on Cellulose" by C. F. Cross
The moneron is an organless, structureless organism, consequently asexual.
"Religion and Lust" by James Weir
It is its structureless character that gives to tin its value.
"Tin Foil and Its Combinations for Filling Teeth" by Henry L. Ambler
"The Machinery of the Universe" by Amos Emerson Dolbear
Its central part was comparatively dense and structureless.
"Essays: Scientific, Political, & Speculative, Vol. I" by Herbert Spencer

In science:

This happens due to the same reasons which are mentioned above in connection with the PBrS of a structureless particle (see (14), (16) and figure 2).
Relativistic effects in polarizational bremsstrahlung
This is a common feature and it does not depend either on the type of the pro jectile (light, heavy, structureless or complex) nor on the type of the interaction between the colliders.
Relativistic effects in polarizational bremsstrahlung
The simulation shows ring structures for the smallest φ, chain structures for intermediate densities (0.06 π 6 < φ < 0.35 π 6 ), where the phase transitions reported in [180] take place, and a structureless dense liquid for still larger φ.
Magnetic properties of colloidal suspensions of interacting magnetic particles
The main motivation behind QC is the failure of applying the conventional quantization concepts and techniques to ‘systems’ (eg, causets or spacetime topologies) whose configuration (or general history) spaces are far from being structureless-pointed differential manifolds.
`Iconoclastic', Categorical Quantum Gravity
Gergely discussed the corrections to the 2PN equations of motion of structureless point-like particles, which arise when the particles are endowed with spins and mass quadrupole moments.
Post-Newtonian Approximations, Compact Binaries, and Strong-Field Tests of Gravity