Irrelevance by virtue of being inapplicable to the matter at hand.

Roget 10: irrelation^†, dissociation; misrelation^†; inapplicability; inconnection^†; multifariousness; disconnection etc. (disjunction) 44; inconsequence, independence; incommensurability; irreconcilableness etc. (disagreement) 24; heterogeneity; unconformity etc. 83; irrelevancy, impertinence, nihil ad rem [Lat.]; intrusion etc. 24; non-pertinence.    ... show more

Roget 24: disagreement; discord, discordance; dissonance, dissidence, discrepancy; unconformity etc. 83; incongruity, incongruence^†; discongruity^†, mesalliance; jarring etc. v.; dissension etc. 713; conflict etc. (opposition) 708; bickering, clashing, misunderstanding, wrangle.    disparity, mismatch, disproportion; dissimilitude, inequality; disproportionateness etc. adj.^†; variance, divergence, repugnance.    unfitness etc. adj.; inaptitude, impropriety; inapplicability etc. adj.; inconsistency, inconcinnity^†; irrelevancy etc. (irrelation) 10.    misjoining^†, misjoinder^†; syncretism^†, intrusion, interference; concordia discors [Lat.].    fish out of water.    ... show more