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Webster 1913 Edition
Imperceivable
Imˊper-ceiv′a-ble
,Adj.
 Imperceptible. 
[R.] 
South. 
– Imˊper-ceiv′a-ble-ness
, Noun.
 Sharp.
 Definition 2025
imperceivable
imperceivable
English
Adjective
imperceivable (comparative more imperceivable, superlative most imperceivable)
-  That cannot be perceived; imperceptible.
- (Can we find and add a quotation of South to this entry?)