Here's what rhymes with gainless.
painless stainless Words that almost rhyme with gainless
aimless nameless shameless blameless anus ageless faithless heinous shapeless baseless faceless graceless weightless grayness greyness basis famous gracious greatness ancients courageous cadence valence sameness tasteless bailiffs faintness lateness plainness quaintness tailless tameness agents acquaintance patience spacious ailments platelets audacious capacious herbaceous hiatus waitress fracas patients arrangements payments surveillance attainments claimants contagious efficacious outrageous tenacious abeyance assailants fallacious pavements sebaceous strangeness vexatious vivacious voracious basements ungracious ignoramus loquacious salacious straightness humaneness profaneness statements conveyance engagements impatience fragrance reagents placements mandamus vagrants flirtatious mendacious inhalants complainants complaisance rearrangements repayments inpatients advantageous entertainments replacements ostentatious emplacements misstatements displacements homeostasis disadvantageous