to impair is a form of:

Impair



1.
(ច្បាប់) បន្ថយ, ធ្វើអោយខ្សោយ
Example: Weaken; make worse; lessen. Fr: Diminuer, porter atteinte.
ឧទាហរណ៍៖ ធ្វើអោយខ្សោយ, ធ្វើអោយដាប ឬធ្វើអោយចុះថយ ។
verbpast tense: impaired ; past participle: impaired ; present participle: impairing ;
1.
(បច្ចេកទេស) ធ្វើអោយខូចខាត, បន្ថយ, ធ្វើអោយខ្សោយ (ធ្វើអោយដាបឬចុះថយ)
2.
(TRANSITIVE) (To make worse, less, etc., to damage, to weaken, to diminish in quantity, value, excellence, or strength) ធ្វើអោយអន់ថយ, ធ្វើអោយខ្សោយ, ធ្វើវិភេទ, អោយខូច, នាំអោយស្រេក, ធ្វើអោយខូចខាត
Example: Reading in poor light impaired his sight.
Example: Loud noise can impair your hearing.
ENGLISH MEANING
adjective
1.
Not fit or appropriate.
verbpast tense: impaired ; past participle: impaired ; present participle: impairing ;
1.
(TRANSITIVE) To make worse; to diminish in quantity, value, excellence, or strength; to deteriorate; as, to impair health, character, the mind, value.
2.
(TRANSITIVE) To grow worse; to deteriorate.
1.
drainage, deface, diminish harm, hurt, injure
2.
lessen, man spoil
1.
ameliorate, benefit, mend, repair, vitiate
1.
Diminution, injury