Here's what rhymes with efficiacious.
spacious vivacious gracious efficacious audacious fallacious herbaceous sebaceous vexatious voracious salacious tenacious capacious flirtatious ungracious loquacious mendacious ostentatious Words that almost rhyme with efficiacious
basis faces phases vases cases bases phrases races spaces raises gazes laces chases mesas places traces praises braces glazes homeostasis fireplaces paraphrases metastases famous heinous patience valence faithless hiatus sameness shameless shapeless faceless fracas patients courageous impatience stainless surveillance cadence nameless painless waitress bailiffs baseless faintness lateness plainness weightless payments greatness fragrance outrageous abeyance assailants blameless tasteless vagrants graceless ignoramus inpatients straightness statements conveyance claimants contagious platelets reagents pavements strangeness basements mandamus quaintness arrangements acquaintance advantageous attainments placements repayments misstatements engagements displacements disadvantageous emplacements entertainments replacements complainants complaisance rearrangements