Synonyms of slack-spined

1 Syllable

null, vain, lame, void

2 Syllables

idle, paltry, inept, worthless, barren, fruitless, feeble, bootless, feckless

3 Syllables

inferior, impotent, limited, forceless, spineless, futile, innocuous, withered, unfruitful, unable, powerless

4 Syllables

abortive, unavailing, nugatory, unsuccessful, incompetent, ineffectual, defeasible, neutralized, inefficient

5 Syllables

unavailable, unprofitable, emasculate, inadequate, unproductive, indecisive, ineffective, anticlimactic, inefficacious

6 Syllables

inoperative