"she cut through the water with her strong arms"

• able to perform a specified action well and powerfully

  "he was not a strong swimmer"

• exerting great force

  "a strong current"

• powerful and difficult to resist or defeat

  "a strong leader"

• (of an argument or case) likely to succeed because of sound reasoning or convincing evidence

  "there is a strong argument for decentralization"

• powerfully affecting the mind, senses, or emotions

  "his imagery made a strong impression on the critics"

• (of language or actions) forceful and extreme, especially excessively or unacceptably so

  "the government were urged to take strong measures against the perpetrators of violence"

"cotton is strong, hard-wearing, and easy to handle"

• not easily affected by disease or hardship

  "despite his strong constitution, constant worry and exposure to the elements had worn him down"

• not easily disturbed, upset, or affected

  "driving on these motorways requires strong nerves"

• firmly held or established

  "he was a man of strong, though unconventional, religious beliefs"

• (of a market) having steadily high or rising prices

"a strong smell"

• (of something seen or heard) not soft or muted; clear or prominent

  "she should wear strong colours"

• (of food or its flavour) distinctive and pungent

  "strong cheese"

• (of a solution or drink) containing a large proportion of a particular substance; concentrated

  "a cup of strong coffee"

• (of an acid or base) fully ionized into cations and anions in solution; having (respectively) a very low or a very high pH

"a hostile crowd several thousands strong"