1.
feeling, sensation
A feeling or impression, especially an unpleasant or unsettling one. Often used in the compound 気味が悪い (creepy, unsettling).
2.
touch of, slight tendency toward
Used as a suffix (~気味) after nouns or verb stems to indicate a slight tendency or early signs of a condition, often something undesirable.
Common patterns
As a standalone noun, 気味 is most commonly used in the phrase 気味が悪い (creepy, unsettling). As a suffix, it attaches to nouns or verb stems with the reading ぎみ (voiced): 風邪気味, 太り気味, 遅れ気味.
Note the reading difference: 気味 as a standalone word vs. ~気味 as a suffix.
Do not confuse with the homophone 君 (you), which uses different kanji.