The highest, flattest, and smoothest part of Tibet (3 ) is the central, Oligo-Miocene plateau, mature but still sheltered, especially in the west, from headward erosion.
Source: wiktionary
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Keep "headward" when the sentence already sounds natural, when a synonym would add unintended emphasis, or when readers need the most familiar wording. A synonym should clarify or sharpen the message, not simply make the sentence look more varied.
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Choose a synonym only if it keeps the core idea of "headward" intact in the sentence you are editing.
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Review note: Synonym lists are ranked with lexical data and reviewed for practical writing value. Use the comparison notes, sentence evidence, and source labels together; a high-ranking synonym can still be wrong when the audience, register, or grammar changes.
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5 total sentences available.
The highest, flattest, and smoothest part of Tibet (3 ) is the central, Oligo-Miocene plateau, mature but still sheltered, especially in the west, from headward erosion.
Source: wiktionary
[View Larger Version of this Image (130K GIF file)] Discussion The martian landforms resemble terrestrial gullies, which form by a combination of processes, including overland flow, headward sapping (32 ), debris flow, and other mass movements (33 )--all processes that, on Earth, involve the action of water.
Source: wiktionary
Even without the structures, there was a morphological feedback: As headward stream channels widened from lateral erosion, new floodplains developed that were lower, fine textured, and vegetated (Fig. 3 ), a condition noted in 1975 (2 ).
Source: wiktionary
When lift is applied, forces are experienced which appear to the pilot as being applied from a headward direction, i.e., from head to toe.
Source: wiktionary
Showing 4 of 5 available sentences.
Closest matches include cephalic, facing, forward, onward.
Compare the replacement against real sentence context. This entry includes sample sentences so you can check tone, grammar, and meaning before swapping words.