kindless
Unnatural; lacking expected feeling or ability.
archaic, literary
Foretell an action of ſuch violence, As to contend with Ammons luſty armes, Sinnewd with vigor of his kindleſſe loue, Faire Thamar now diſhonour hunts thy foot,
Poore Thamar, little did thy louely handsHeartless; destitute of kindness.
archaic
For a selfish and kindless nature no apologist dare appear : while in behalf of those who err from the excess of generous affections, there standeth ever a mediating angel between them and their worst offences.
Having no specific kind, unspecified, general.
Types are called kindless if their interface has been specified, but we have not yet decided how to describe their behavior and we do not know their kind. We have currently implemented kindless objects as regular objects with a predefined behavior.
Where it comes from
From kind (“inherent quality, nature”, noun) + -less. Compare Middle English kindelæs (“incapable of generation, barren”). The sense "destitute of kindness" is likely influenced by kind (“benevolent; affectionate”, adjective).
Adapted from the Wiktionary entry kindless (CC BY-SA 4.0).