expression, i-adjective
slow to kindle; hard to light
Rare expression meaning that something does not catch fire easily. Usually written in kana. More common alternatives include 火がつきにくい or 燃えにくい.
この薪は湿っていて、ひつきがわるい。
This firewood is damp and slow to kindle.
Compound of 火付き (ひつき, 'kindling, catching fire') + が + 悪い (わるい, 'bad'). The exact derivation is uncertain, but it follows a common pattern of describing a property as 'bad'.