Substitute

Impervious to external influence; airtight

Obvious

Bitter conflict; discord; a struggle or clash

Unlucky

Irreversible

Combative; quarrelsome; waging war

Habitual; firm in habit; deeply rooted

Burdensome; oppressive

Thoroughly competent; skillful; very good at something; as an expert

Relating to discussions; relating to the rules and methods of reasoning; the middle of opposing extremes

Admitting guilt; especially feeling remorseful

Meaning the opposite of what you seem to say; using words to mean something other than what they seem to mean

Having to do with artistic beauty; artistic

Unadorned; stern; forbidding; without excess

Eager to believe; gullible

Different; incompatible; unequal

Fleeting; vanishing; happening for only the briefest period

Impulsive; extremely impatient

Abundantly productive; fruitful or fertile

Arrogantly assertive of unproven ideas

Conditional; temporary; tentative

Malicious; unjustifiable; unprovoked