Synonyms:
- Herculean,
- abstruse,
- allergic,
- anaphylactic,
- arduous,
- awkward,
- brutal,
- capricious,
- changeable,
- complex,
- critical,
- dangerous,
- delicate,
- demanding,
- desultory,
- difficile,
- difficult,
- empathetic,
- empathic,
- exacting,
- fickle,
- formidable,
- fragile,
- goosy,
- hairy,
- hard,
- hard-earned,
- hard-fought,
- hazardous,
- high-strung,
- hyperesthetic,
- hyperpathic,
- hypersensitive,
- infirm,
- insecure,
- insubstantial,
- intricate,
- irritable,
- itchy,
- jawbreaking,
- knotted,
- knotty,
- laborious,
- mean,
- mercurial,
- miffy,
- nervous,
- no picnic,
- not easy,
- on slippery ground,
- on thin ice,
- operose,
- overrefined,
- oversensible,
- oversensitive,
- overtender,
- passible,
- perilous,
- precarious,
- prickly,
- provisional,
- refined,
- responsive,
- rigorous,
- risky,
- rocky,
- rough,
- rugged,
- sensitive,
- set with thorns,
- severe,
- shaky,
- shifting,
- shifty,
- skittish,
- slippery,
- slippy,
- spiny,
- steep,
- strenuous,
- supersensitive,
- sympathetic,
- tactful,
- temperamental,
- temporary,
- tender,
- tentative,
- tetchy,
- thin-skinned,
- thorny,
- tickling,
- tickly,
- titillative,
- toilsome,
- touch-and-go,
- touchy,
- tough,
- treacherous,
- tricky,
- uncertain,
- undependable,
- unfaithworthy,
- unreliable,
- unsettled,
- unsolid,
- unsound,
- unstable,
- unsteadfast,
- unsteady,
- unsubstantial,
- unsure,
- untrustworthy,
- uphill,
- variable,
- volatile,
- wicked