Headstrong and Hard line

Headstrong adjective - Given to resisting control or discipline by others.

Hard line and headstrong are semantically related In some cases you can replace phrase "Hard line" with "Headstrong", this terms are similar.

Hard line noun - A firm and uncompromising stance or position.

Headstrong and hard line are semantically related in steadfast topic. Sometimes you can use "Headstrong" instead an adjective phrase "Hard line", if it concerns topics such as obstinate, difficult, tough.