cracklessly

== English == === Etymology === From crackless +‎ -ly. === Adverb === cracklessly (comparative more cracklessly, superlative most cracklessly) in a crackless manner 1932, American Society of Naval Engineers, Journal of the American Society of Naval Engineers, Volume 44, Issue 4 "The ordinary tests for ductility do not give very much information of the ability of a metal to undergo such localized plastic readjustment cracklessly."