Not possessing or endowed with any specific qualities; of an undefined or indefinable nature. Obsolete.

Of uncertain nature; not admitting of being classified, ‘nondescript’. equivocal generation n. the (supposed) production of plants or animals…

(un-, prefix1 affix 2.)

Having no strongly marked effects, characteristics, etc.; undefined, indefinite, vague. Now rare or merged in sense B. 4.

Lacking distinctive or interesting features; not easily described; dull, drab.

Indistinguishable from others of its kind; unexceptional; bland, generic, nondescript.