1. confined or restricted with or as if with a rope or chain
The Collaborative International Dictionary of English v.0.48:
Tether \Teth"er\, v. t. [imp. & p. p. Tethered; p. pr. & vb.
To confine, as an animal, with a long rope or chain, as for
feeding within certain limits.
And by a slender cord was tethered to a stone.
Moby Thesaurus II by Grady Ward, 1.0:
35 Moby Thesaurus words for "tethered":
aground, anchored, bound, caught, chained, fast, fastened,
fettered, fixed, grounded, hampered, handcuffed, held,
high and dry, impacted, in bonds, in chains, in irons,
inextricable, ironbound, jammed, manacled, moored, packed,
shackled, stranded, strapped, stuck, stuck fast, tied, tied down,
tied up, trammeled, transfixed, wedged