sackable

1. (of an act) Sufficiently severe to warrant the perpetrator being sacked.Examples: "This follows the confirmation that Gilruth personally ordered the cancellation of engineering works in Fife last year, which is thought to have been the final straw for Gibb […]. Because her Fife constituency was materially affected by the cancellation, Scottish Conservative leader Douglas Ross, who raised Gibb's departure at First Minister's Questions on May 18, described the incident as a "clear-cut sackable offence"."