Another way to say “difficult”

A Scottish idiom for people or things that are unpredictable, tricky, and hard to manage — the human equivalent of livestock that won't stay in their pen. 'Kittle' means ticklish or difficult in Scots, and cattle were historically the ultimate test of patience. Together, kittle cattle perfectly captures that exasperated shrug when dealing with a group that refuses to cooperate, behave, or make any sense whatsoever.

Australian and New Zealand military slang for hardtack — the extremely dense, dry biscuit issued as field rations to soldiers when fresh food was unavailable. The term comes from World War I, when ANZAC (Australian and New Zealand Army Corps) troops were issued hardtack biscuits as part of their field rations. The "wafer" label is ironic given hardtack's notoriously tough, jaw-challenging texture. The term is primarily historical and is associated with ANZAC military heritage.

An extremely tough and strong athlete, especially one who competes in extreme athletic competitions or in a large number of games consecutively.

or strenuously active.

(slang, mildly, _, vulgar) Beset with unfortunate circumstances that seem difficult or impossible to overcome; in imminent danger.

(slang, archaic) Difficult to beat; sure to succeed.

(US, theatre, derogatory) A grueling and often unprofitable tour of small theaters from Chicago to the West Coast.

(US) Part of a prison used for the segregation and isolation of difficult prisoners.

(idiomatic, US, chiefly, _, colloquial) An authorization that is extremely difficult to obtain, especially in a timely fashion.

(Australia, horse racing) A racehorse that is difficult to control when being put into the starting gates.

(chiefly, British, idiomatic, dated) To make a task more difficult for someone.

(UK, Irish, Commonwealth) Any tough, transparent plastic that is used instead of glass for windows.

(transitive) To put in an extremely difficult or impossible situation.

(UK, military, slang) The imposition of arduous exercises, either as training or as punishment.

A dumb, crass, or clumsy person, or a person who is difficult or stubborn.