Antonyms of adj full-strength

1 sense of full-strength

Sense 1
neat, straight, full-strength -- (without water; "took his whiskey neat")

INDIRECT (VIA undiluted) -> diluted, dilute -- (reduced in strength or concentration or quality or purity; "diluted alcohol"; "a dilute solution"; "dilute acetic acid")

Similarity of adj full-strength

1 sense of full-strength

Sense 1
neat, straight, full-strength -- (without water; "took his whiskey neat")
       => undiluted (vs. diluted) -- (not diluted; "undiluted milk"; "an undiluted racial strain")