All terms in this list:

attrition: A gradual, natural reduction in membership or personnel, as through retirement, resignation, or death

circumvent: to avoid or get around something; to bypass

cohere: To be consistent as part of a group; to stick together physically, by adhesion or figuratively by common purpose

grievous: serious, grave, dire or dangerous; causing grief or pain

inundate: To cover with large amounts of water; to flood.

oblivious: Lacking awareness; unmindful.

reticent: Keeping one's thoughts and opinions to oneself; reserved or restrained.

robust: Evincing strength; indicating vigorous health

sanction: To give authorization or approval to something; to ratify.

vociferous: Making or characterized by a noisy outcry; clamorous.