accidendus

Future passive participle (gerundive) of accīdō (“fell, cut down; use up; impair”).

accīdendus (feminine accīdenda, neuter accīdendum); first/second-declension participle

1. which is to begin to be cut into, which is to begin to be cut through, which is to be felled, which is to be cut down
2. which is to be used up, which is to be consumed, which is to be diminished
3. which is to be impaired, which is to be weakened, which is to be shattered

First/second-declension adjective.